diff --git a/module/custom/control.php b/module/custom/control.php
index 416bcd8da1..9c8b9532fa 100644
--- a/module/custom/control.php
+++ b/module/custom/control.php
@@ -364,16 +364,6 @@ class custom extends control
             $data = fixer::input('post')->get();
 
             /* Judgment of required items. */
-            if(($unit != $_POST['hourPoint']) and empty($_POST['scaleFactor']))
-            {
-                dao::$errors['scaleFactor'] = sprintf($this->lang->error->notempty, $this->lang->custom->convertRelations);
-                $this->send(array('result' => 'fail', 'message' => dao::getError()));
-            }
-            elseif(($unit != $_POST['hourPoint']) and !is_numeric($_POST['scaleFactor']))
-            {
-                dao::$errors['scaleFactor'] = sprintf($this->lang->error->float, $this->lang->custom->convertRelations);
-                $this->send(array('result' => 'fail', 'message' => dao::getError()));
-            }
 
             $this->setting->setItem('system.custom.hourPoint', $data->hourPoint);
             $this->setting->setItem('system.custom.scaleFactor', $data->scaleFactor);
diff --git a/module/custom/js/estimate.js b/module/custom/js/estimate.js
index 445f72e2e1..90c9f7f2f4 100644
--- a/module/custom/js/estimate.js
+++ b/module/custom/js/estimate.js
@@ -4,18 +4,23 @@ $(document).ready(function()
     $('input[name="hourPoint"]').change(function()
     {
         /* Show or hide conversion relation fields. */
-        if($(this).val() == unit)
+        if($(this).val() != unit)
         {
-            $('#convertRelations').addClass('hidden');
-        }
-        else
-        {
-            $('#convertRelations').removeClass('hidden');
+            if($(this).val() == 0) var hourPoint = workingHours;
+            if($(this).val() == 1) var hourPoint = storyPoint;
+            if($(this).val() == 2) var hourPoint = functionPoint;
+
+            convertRelationTitle = convertRelationTitle.replace('%s', hourPoint);
+            convertRelationTips  = convertRelationTips.replace(/%s/g, hourPoint);
+            $('#factor + span').text(hourPoint);
+
+            $('#title').text(convertRelationTitle);
+            $('#tips').text(convertRelationTips);
+            $('#convertRelations').modal({show: true});
         }
 
         if($(this).val() == 0)
         {
-            $('#scaleFactor + span').text(workingHours);
             $('#efficiency + span').text(workingHours);
             $('#efficiency').val("1");
             $('.efficiency').addClass('hidden');
@@ -27,15 +32,37 @@ $(document).ready(function()
             $('.efficiency').removeClass('hidden');
             if($(this).val() == 1)
             {
-                $('#scaleFactor + span').text(storyPoint);
                 $('#efficiency + span').text(efficiency + storyPoint);
             }
 
             if($(this).val() == 2)
             {
-                $('#scaleFactor + span').text(functionPoint);
                 $('#efficiency + span').text(efficiency + functionPoint);
             }
         }
     });
 });
+
+/**
+ * Set scale factor.
+ *
+ * @access public
+ * @return void
+ */
+function setScaleFactor()
+{
+    var scaleFactor = $('#factor').val();
+    if(!scaleFactor)
+    {
+        alert(notempty);
+    }
+    else if(isNaN(scaleFactor))
+    {
+        alert(notNumber);
+    }
+    else
+    {
+        $('#scaleFactor').val(scaleFactor);
+        $('#convertRelations').modal('hide');
+    }
+}
diff --git a/module/custom/lang/de.php b/module/custom/lang/de.php
index 447b9286e5..5649baf313 100644
--- a/module/custom/lang/de.php
+++ b/module/custom/lang/de.php
@@ -1,55 +1,56 @@
 <?php
-$lang->custom->common             = 'Custom';
-$lang->custom->index              = 'Home';
-$lang->custom->set                = 'Customize';
-$lang->custom->restore            = 'Reset to Default';
-$lang->custom->key                = 'Key';
-$lang->custom->value              = 'Value';
-$lang->custom->flow               = 'Concept';
-$lang->custom->working            = 'WorkStyle';
-$lang->custom->select             = 'Select Concept';
-$lang->custom->branch             = 'Multi Branch';
-$lang->custom->owner              = 'Owner';
-$lang->custom->module             = 'Module';
-$lang->custom->section            = 'Section';
-$lang->custom->lang               = 'Language';
-$lang->custom->setPublic          = 'Set Public';
-$lang->custom->required           = 'Required';
-$lang->custom->score              = 'Score';
-$lang->custom->timezone           = 'Timezone';
-$lang->custom->scoreReset         = 'Reset Score';
-$lang->custom->scoreTitle         = 'Point Feature';
-$lang->custom->project            = $lang->sprintCommon;
-$lang->custom->product            = $lang->productCommon;
-$lang->custom->estimate           = 'Estimated configuration';
-$lang->custom->estimateConfig     = 'Estimated configuration';
-$lang->custom->estimateUnit       = 'Estimating Unit';
-$lang->custom->estimateEfficiency = 'Productivity';
-$lang->custom->estimateCost       = 'Unit Labour Cost';
-$lang->custom->estimateHours      = 'Daily Working Hours';
-$lang->custom->estimateDays       = 'Working Days Per Week';
-$lang->custom->convertRelations   = 'Convert Relations';
-$lang->custom->region             = 'Interval';
-$lang->custom->tips               = 'Tips';
-$lang->custom->setTips            = 'Set Tips';
-$lang->custom->isRange            = 'Is Target Control';
-$lang->custom->concept            = "Concept";
-$lang->custom->URStory            = "User requirements";
-$lang->custom->SRStory            = "Software requirements";
-$lang->custom->epic               = "Epic";
-$lang->custom->scrumStory         = "Story";
-$lang->custom->waterfallCommon    = "Waterfall";
-$lang->custom->buildin            = "Buildin";
-$lang->custom->isDefault          = 'Is Default';
-$lang->custom->editStoryConcept   = "Edit Story Concept";
-$lang->custom->setStoryConcept    = "Set Story Concept";
-$lang->custom->setDefaultConcept  = "Set Default Concept";
-$lang->custom->browseStoryConcept = "List of story concepts";
-$lang->custom->deleteStoryConcept = "Delete story Concept";
-$lang->custom->configureScrum     = "Scrum Model Custom";
-$lang->custom->URConcept          = "UR Concept";
-$lang->custom->SRConcept          = "SR Concept";
-$lang->custom->one                = " One";
+$lang->custom->common               = 'Custom';
+$lang->custom->index                = 'Home';
+$lang->custom->set                  = 'Customize';
+$lang->custom->restore              = 'Reset to Default';
+$lang->custom->key                  = 'Key';
+$lang->custom->value                = 'Value';
+$lang->custom->flow                 = 'Concept';
+$lang->custom->working              = 'WorkStyle';
+$lang->custom->select               = 'Select Concept';
+$lang->custom->branch               = 'Multi Branch';
+$lang->custom->owner                = 'Owner';
+$lang->custom->module               = 'Module';
+$lang->custom->section              = 'Section';
+$lang->custom->lang                 = 'Language';
+$lang->custom->setPublic            = 'Set Public';
+$lang->custom->required             = 'Required';
+$lang->custom->score                = 'Score';
+$lang->custom->timezone             = 'Timezone';
+$lang->custom->scoreReset           = 'Reset Score';
+$lang->custom->scoreTitle           = 'Point Feature';
+$lang->custom->project              = $lang->sprintCommon;
+$lang->custom->product              = $lang->productCommon;
+$lang->custom->estimate             = 'Estimated configuration';
+$lang->custom->estimateConfig       = 'Estimated configuration';
+$lang->custom->estimateUnit         = 'Estimating Unit';
+$lang->custom->estimateEfficiency   = 'Productivity';
+$lang->custom->estimateCost         = 'Unit Labour Cost';
+$lang->custom->estimateHours        = 'Daily Working Hours';
+$lang->custom->estimateDays         = 'Working Days Per Week';
+$lang->custom->scaleFactor          = 'Conversion factor';
+$lang->custom->region               = 'Interval';
+$lang->custom->tips                 = 'Tips';
+$lang->custom->setTips              = 'Set Tips';
+$lang->custom->isRange              = 'Is Target Control';
+$lang->custom->concept              = "Concept";
+$lang->custom->URStory              = "User requirements";
+$lang->custom->SRStory              = "Software requirements";
+$lang->custom->epic                 = "Epic";
+$lang->custom->scrumStory           = "Story";
+$lang->custom->waterfallCommon      = "Waterfall";
+$lang->custom->buildin              = "Buildin";
+$lang->custom->isDefault            = 'Is Default';
+$lang->custom->editStoryConcept     = "Edit Story Concept";
+$lang->custom->setStoryConcept      = "Set Story Concept";
+$lang->custom->setDefaultConcept    = "Set Default Concept";
+$lang->custom->browseStoryConcept   = "List of story concepts";
+$lang->custom->deleteStoryConcept   = "Delete story Concept";
+$lang->custom->configureScrum       = "Scrum Model Custom";
+$lang->custom->URConcept            = "UR Concept";
+$lang->custom->SRConcept            = "SR Concept";
+$lang->custom->oneUnit              = "One {$lang->hourCommon}";
+$lang->custom->convertRelationTitle = "Conversion factor of {$lang->hourCommon} converted to %s";
 
 $lang->custom->unitList['efficiency'] = 'Working Hours/';
 $lang->custom->unitList['manhour']    = 'Man-hour/';
@@ -67,10 +68,11 @@ $lang->custom->tipCostList['CV']  = 'Cost Variance(CV%)';
 $lang->custom->tipRangeList[0]  = 'No';
 $lang->custom->tipRangeList[1]  = 'Yes';
 
-$lang->custom->regionMustNumber = 'The interval must be a number!';
-$lang->custom->tipNotEmpty      = 'The prompt can not be empty!';
-$lang->custom->currencyNotEmpty = 'You have to select one currency at least.';
-$lang->custom->defaultNotEmpty  = 'The default currency can not be empty';
+$lang->custom->regionMustNumber    = 'The interval must be a number!';
+$lang->custom->tipNotEmpty         = 'The prompt can not be empty!';
+$lang->custom->currencyNotEmpty    = 'You have to select one currency at least.';
+$lang->custom->defaultNotEmpty     = 'The default currency can not be empty';
+$lang->custom->convertRelationTips = "After {$lang->hourCommon} is converted to %s, historical data will be uniformly converted to %s";
 
 $lang->custom->numberError = 'The interval must be greater than zero!';
 
diff --git a/module/custom/lang/en.php b/module/custom/lang/en.php
index 6e99070d28..4b05c2278f 100644
--- a/module/custom/lang/en.php
+++ b/module/custom/lang/en.php
@@ -1,55 +1,56 @@
 <?php
-$lang->custom->common             = 'Custom';
-$lang->custom->index              = 'Home';
-$lang->custom->set                = 'Customize';
-$lang->custom->restore            = 'Reset';
-$lang->custom->key                = 'Key';
-$lang->custom->value              = 'Value';
-$lang->custom->flow               = 'Concept';
-$lang->custom->working            = 'Mode';
-$lang->custom->select             = 'Select Concept';
-$lang->custom->branch             = 'Multi-Branch';
-$lang->custom->owner              = 'Owner';
-$lang->custom->module             = 'Module';
-$lang->custom->section            = 'Section';
-$lang->custom->lang               = 'Language';
-$lang->custom->setPublic          = 'Set Public';
-$lang->custom->required           = 'Required Field';
-$lang->custom->score              = 'Point';
-$lang->custom->timezone           = 'Timezone';
-$lang->custom->scoreReset         = 'Reset Points';
-$lang->custom->scoreTitle         = 'Point Feature';
-$lang->custom->project            = $lang->sprintCommon;
-$lang->custom->product            = $lang->productCommon;
-$lang->custom->estimate           = 'Estimated configuration';
-$lang->custom->estimateConfig     = 'Estimated configuration';
-$lang->custom->estimateUnit       = 'Estimating Unit';
-$lang->custom->estimateEfficiency = 'Productivity';
-$lang->custom->estimateCost       = 'Unit Labour Cost';
-$lang->custom->estimateHours      = 'Daily Working Hours';
-$lang->custom->estimateDays       = 'Working Days Per Week';
-$lang->custom->convertRelations   = 'Convert Relations';
-$lang->custom->region             = 'Interval';
-$lang->custom->tips               = 'Tips';
-$lang->custom->setTips            = 'Set Tips';
-$lang->custom->isRange            = 'Is Target Control';
-$lang->custom->concept            = "Concept";
-$lang->custom->URStory            = "User requirements";
-$lang->custom->SRStory            = "Software requirements";
-$lang->custom->epic               = "Epic";
-$lang->custom->scrumStory         = "Story";
-$lang->custom->waterfallCommon    = "Waterfall";
-$lang->custom->buildin            = "Buildin";
-$lang->custom->isDefault          = 'Is Default';
-$lang->custom->editStoryConcept   = "Edit Story Concept";
-$lang->custom->setStoryConcept    = "Set Story Concept";
-$lang->custom->setDefaultConcept  = "Set Default Concept";
-$lang->custom->browseStoryConcept = "List of story concepts";
-$lang->custom->deleteStoryConcept = "Delete story Concept";
-$lang->custom->configureScrum     = "Scrum Model Custom";
-$lang->custom->URConcept          = "UR Concept";
-$lang->custom->SRConcept          = "SR Concept";
-$lang->custom->one                = " One";
+$lang->custom->common               = 'Custom';
+$lang->custom->index                = 'Home';
+$lang->custom->set                  = 'Customize';
+$lang->custom->restore              = 'Reset';
+$lang->custom->key                  = 'Key';
+$lang->custom->value                = 'Value';
+$lang->custom->flow                 = 'Concept';
+$lang->custom->working              = 'Mode';
+$lang->custom->select               = 'Select Concept';
+$lang->custom->branch               = 'Multi-Branch';
+$lang->custom->owner                = 'Owner';
+$lang->custom->module               = 'Module';
+$lang->custom->section              = 'Section';
+$lang->custom->lang                 = 'Language';
+$lang->custom->setPublic            = 'Set Public';
+$lang->custom->required             = 'Required Field';
+$lang->custom->score                = 'Point';
+$lang->custom->timezone             = 'Timezone';
+$lang->custom->scoreReset           = 'Reset Points';
+$lang->custom->scoreTitle           = 'Point Feature';
+$lang->custom->project              = $lang->sprintCommon;
+$lang->custom->product              = $lang->productCommon;
+$lang->custom->estimate             = 'Estimated configuration';
+$lang->custom->estimateConfig       = 'Estimated configuration';
+$lang->custom->estimateUnit         = 'Estimating Unit';
+$lang->custom->estimateEfficiency   = 'Productivity';
+$lang->custom->estimateCost         = 'Unit Labour Cost';
+$lang->custom->estimateHours        = 'Daily Working Hours';
+$lang->custom->estimateDays         = 'Working Days Per Week';
+$lang->custom->scaleFactor          = 'Conversion factor';
+$lang->custom->region               = 'Interval';
+$lang->custom->tips                 = 'Tips';
+$lang->custom->setTips              = 'Set Tips';
+$lang->custom->isRange              = 'Is Target Control';
+$lang->custom->concept              = "Concept";
+$lang->custom->URStory              = "User requirements";
+$lang->custom->SRStory              = "Software requirements";
+$lang->custom->epic                 = "Epic";
+$lang->custom->scrumStory           = "Story";
+$lang->custom->waterfallCommon      = "Waterfall";
+$lang->custom->buildin              = "Buildin";
+$lang->custom->isDefault            = 'Is Default';
+$lang->custom->editStoryConcept     = "Edit Story Concept";
+$lang->custom->setStoryConcept      = "Set Story Concept";
+$lang->custom->setDefaultConcept    = "Set Default Concept";
+$lang->custom->browseStoryConcept   = "List of story concepts";
+$lang->custom->deleteStoryConcept   = "Delete story Concept";
+$lang->custom->configureScrum       = "Scrum Model Custom";
+$lang->custom->URConcept            = "UR Concept";
+$lang->custom->SRConcept            = "SR Concept";
+$lang->custom->oneUnit              = "One {$lang->hourCommon}";
+$lang->custom->convertRelationTitle = "Conversion factor of {$lang->hourCommon} converted to %s";
 
 $lang->custom->unitList['efficiency'] = 'Working Hours/';
 $lang->custom->unitList['manhour']    = 'Man-hour/';
@@ -67,10 +68,11 @@ $lang->custom->tipCostList['CV']  = 'Cost Variance(CV%)';
 $lang->custom->tipRangeList[0]  = 'No';
 $lang->custom->tipRangeList[1]  = 'Yes';
 
-$lang->custom->regionMustNumber = 'The interval must be a number!';
-$lang->custom->tipNotEmpty      = 'The prompt can not be empty!';
-$lang->custom->currencyNotEmpty = 'You have to select one currency at least.';
-$lang->custom->defaultNotEmpty  = 'The default currency can not be empty';
+$lang->custom->regionMustNumber    = 'The interval must be a number!';
+$lang->custom->tipNotEmpty         = 'The prompt can not be empty!';
+$lang->custom->currencyNotEmpty    = 'You have to select one currency at least.';
+$lang->custom->defaultNotEmpty     = 'The default currency can not be empty';
+$lang->custom->convertRelationTips = "After {$lang->hourCommon} is converted to %s, historical data will be uniformly converted to %s";
 
 $lang->custom->numberError = 'The interval must be greater than zero!';
 
diff --git a/module/custom/lang/fr.php b/module/custom/lang/fr.php
index 1481547532..0d3194c2c6 100644
--- a/module/custom/lang/fr.php
+++ b/module/custom/lang/fr.php
@@ -1,55 +1,56 @@
 <?php
-$lang->custom->common             = 'Personnalisation';
-$lang->custom->index              = 'Accueil';
-$lang->custom->set                = 'Personnaliser';
-$lang->custom->restore            = 'Réinitialiser';
-$lang->custom->key                = 'Clé';
-$lang->custom->value              = 'Valeur';
-$lang->custom->flow               = 'Concept';
-$lang->custom->working            = 'Mode';
-$lang->custom->select             = 'Choix du Concept';
-$lang->custom->branch             = 'Multi-Branches';
-$lang->custom->owner              = 'Propriétaire';
-$lang->custom->module             = 'Module';
-$lang->custom->section            = 'Section';
-$lang->custom->lang               = 'Langue';
-$lang->custom->setPublic          = 'Set Public';
-$lang->custom->required           = 'Champ Obligatoire';
-$lang->custom->score              = 'Point';
-$lang->custom->timezone           = 'Timezone';
-$lang->custom->scoreReset         = 'Réinit Points';
-$lang->custom->scoreTitle         = 'Fonctionnalité des Points';
-$lang->custom->project            = $lang->sprintCommon;
-$lang->custom->product            = $lang->productCommon;
-$lang->custom->estimate           = 'Estimated configuration';
-$lang->custom->estimateConfig     = 'Estimated configuration';
-$lang->custom->estimateUnit       = 'Estimating Unit';
-$lang->custom->estimateEfficiency = 'Productivity';
-$lang->custom->estimateCost       = 'Unit Labour Cost';
-$lang->custom->estimateHours      = 'Daily Working Hours';
-$lang->custom->estimateDays       = 'Working Days Per Week';
-$lang->custom->convertRelations   = 'Convert Relations';
-$lang->custom->region             = 'Interval';
-$lang->custom->tips               = 'Tips';
-$lang->custom->setTips            = 'Set Tips';
-$lang->custom->isRange            = 'Is Target Control';
-$lang->custom->concept            = "Concept";
-$lang->custom->URStory            = "User requirements";
-$lang->custom->SRStory            = "Software requirements";
-$lang->custom->epic               = "Epic";
-$lang->custom->scrumStory         = "Story";
-$lang->custom->waterfallCommon    = "Waterfall";
-$lang->custom->buildin            = "Buildin";
-$lang->custom->isDefault          = 'Is Default';
-$lang->custom->editStoryConcept   = "Edit Story Concept";
-$lang->custom->setStoryConcept    = "Set Story Concept";
-$lang->custom->setDefaultConcept  = "Set Default Concept";
-$lang->custom->browseStoryConcept = "List of story concepts";
-$lang->custom->deleteStoryConcept = "Delete story Concept";
-$lang->custom->configureScrum     = "Scrum Model Custom";
-$lang->custom->URConcept          = "UR Concept";
-$lang->custom->SRConcept          = "SR Concept";
-$lang->custom->one                = " One";
+$lang->custom->common               = 'Personnalisation';
+$lang->custom->index                = 'Accueil';
+$lang->custom->set                  = 'Personnaliser';
+$lang->custom->restore              = 'Réinitialiser';
+$lang->custom->key                  = 'Clé';
+$lang->custom->value                = 'Valeur';
+$lang->custom->flow                 = 'Concept';
+$lang->custom->working              = 'Mode';
+$lang->custom->select               = 'Choix du Concept';
+$lang->custom->branch               = 'Multi-Branches';
+$lang->custom->owner                = 'Propriétaire';
+$lang->custom->module               = 'Module';
+$lang->custom->section              = 'Section';
+$lang->custom->lang                 = 'Langue';
+$lang->custom->setPublic            = 'Set Public';
+$lang->custom->required             = 'Champ Obligatoire';
+$lang->custom->score                = 'Point';
+$lang->custom->timezone             = 'Timezone';
+$lang->custom->scoreReset           = 'Réinit Points';
+$lang->custom->scoreTitle           = 'Fonctionnalité des Points';
+$lang->custom->project              = $lang->sprintCommon;
+$lang->custom->product              = $lang->productCommon;
+$lang->custom->estimate             = 'Estimated configuration';
+$lang->custom->estimateConfig       = 'Estimated configuration';
+$lang->custom->estimateUnit         = 'Estimating Unit';
+$lang->custom->estimateEfficiency   = 'Productivity';
+$lang->custom->estimateCost         = 'Unit Labour Cost';
+$lang->custom->estimateHours        = 'Daily Working Hours';
+$lang->custom->estimateDays         = 'Working Days Per Week';
+$lang->custom->scaleFactor          = 'Conversion factor';
+$lang->custom->region               = 'Interval';
+$lang->custom->tips                 = 'Tips';
+$lang->custom->setTips              = 'Set Tips';
+$lang->custom->isRange              = 'Is Target Control';
+$lang->custom->concept              = "Concept";
+$lang->custom->URStory              = "User requirements";
+$lang->custom->SRStory              = "Software requirements";
+$lang->custom->epic                 = "Epic";
+$lang->custom->scrumStory           = "Story";
+$lang->custom->waterfallCommon      = "Waterfall";
+$lang->custom->buildin              = "Buildin";
+$lang->custom->isDefault            = 'Is Default';
+$lang->custom->editStoryConcept     = "Edit Story Concept";
+$lang->custom->setStoryConcept      = "Set Story Concept";
+$lang->custom->setDefaultConcept    = "Set Default Concept";
+$lang->custom->browseStoryConcept   = "List of story concepts";
+$lang->custom->deleteStoryConcept   = "Delete story Concept";
+$lang->custom->configureScrum       = "Scrum Model Custom";
+$lang->custom->URConcept            = "UR Concept";
+$lang->custom->SRConcept            = "SR Concept";
+$lang->custom->oneUnit              = "One {$lang->hourCommon}";
+$lang->custom->convertRelationTitle = "Conversion factor of {$lang->hourCommon} converted to %s";
 
 $lang->custom->unitList['efficiency'] = 'Working Hours/';
 $lang->custom->unitList['manhour']    = 'Man-hour/';
@@ -67,10 +68,11 @@ $lang->custom->tipCostList['CV']  = 'Cost Variance(CV%)';
 $lang->custom->tipRangeList[0]  = 'No';
 $lang->custom->tipRangeList[1]  = 'Yes';
 
-$lang->custom->regionMustNumber = 'The interval must be a number!';
-$lang->custom->tipNotEmpty      = 'The prompt can not be empty!';
-$lang->custom->currencyNotEmpty = 'You have to select one currency at least.';
-$lang->custom->defaultNotEmpty  = 'The default currency can not be empty';
+$lang->custom->regionMustNumber    = 'The interval must be a number!';
+$lang->custom->tipNotEmpty         = 'The prompt can not be empty!';
+$lang->custom->currencyNotEmpty    = 'You have to select one currency at least.';
+$lang->custom->defaultNotEmpty     = 'The default currency can not be empty';
+$lang->custom->convertRelationTips = "After {$lang->hourCommon} is converted to %s, historical data will be uniformly converted to %s";
 
 $lang->custom->numberError = 'The interval must be greater than zero!';
 
diff --git a/module/custom/lang/vi.php b/module/custom/lang/vi.php
index 02b6334734..7fd65b7f2a 100644
--- a/module/custom/lang/vi.php
+++ b/module/custom/lang/vi.php
@@ -1,55 +1,56 @@
 <?php
-$lang->custom->common             = 'Tùy biến';
-$lang->custom->index              = 'Trang chủ';
-$lang->custom->set                = 'Tùy biến';
-$lang->custom->restore            = 'Thiết lập lại';
-$lang->custom->key                = 'Khóa';
-$lang->custom->value              = 'Giá trị';
-$lang->custom->flow               = 'Mô hình';
-$lang->custom->working            = 'Chế độ';
-$lang->custom->select             = 'Chọn mô hình';
-$lang->custom->branch             = 'Multi-Branch';
-$lang->custom->owner              = 'Sở hữu';
-$lang->custom->module             = 'Module';
-$lang->custom->section            = 'Section';
-$lang->custom->lang               = 'Ngôn ngữ';
-$lang->custom->setPublic          = 'Thiết lập Public';
-$lang->custom->required           = 'Trường bắt buộc';
-$lang->custom->score              = 'Điểm';
-$lang->custom->timezone           = 'Timezone';
-$lang->custom->scoreReset         = 'Thiết lập lại điểm';
-$lang->custom->scoreTitle         = 'Tính năng điểm';
-$lang->custom->project            = $lang->sprintCommon;
-$lang->custom->product            = $lang->productCommon;
-$lang->custom->estimate           = 'Estimated configuration';
-$lang->custom->estimateConfig     = 'Estimated configuration';
-$lang->custom->estimateUnit       = 'Estimating Unit';
-$lang->custom->estimateEfficiency = 'Productivity';
-$lang->custom->estimateCost       = 'Unit Labour Cost';
-$lang->custom->estimateHours      = 'Daily Working Hours';
-$lang->custom->estimateDays       = 'Working Days Per Week';
-$lang->custom->convertRelations   = 'Convert Relations';
-$lang->custom->region             = 'Interval';
-$lang->custom->tips               = 'Tips';
-$lang->custom->setTips            = 'Set Tips';
-$lang->custom->isRange            = 'Is Target Control';
-$lang->custom->concept            = "Concept";
-$lang->custom->URStory            = "User requirements";
-$lang->custom->SRStory            = "Software requirements";
-$lang->custom->epic               = "Epic";
-$lang->custom->scrumStory         = "Story";
-$lang->custom->waterfallCommon    = "Waterfall";
-$lang->custom->buildin            = "Buildin";
-$lang->custom->isDefault          = 'Is Default';
-$lang->custom->editStoryConcept   = "Edit Story Concept";
-$lang->custom->setStoryConcept    = "Set Story Concept";
-$lang->custom->setDefaultConcept  = "Set Default Concept";
-$lang->custom->browseStoryConcept = "List of story concepts";
-$lang->custom->deleteStoryConcept = "Delete story Concept";
-$lang->custom->configureScrum     = "Scrum Model Custom";
-$lang->custom->URConcept          = "UR Concept";
-$lang->custom->SRConcept          = "SR Concept";
-$lang->custom->one                = " One";
+$lang->custom->common               = 'Tùy biến';
+$lang->custom->index                = 'Trang chủ';
+$lang->custom->set                  = 'Tùy biến';
+$lang->custom->restore              = 'Thiết lập lại';
+$lang->custom->key                  = 'Khóa';
+$lang->custom->value                = 'Giá trị';
+$lang->custom->flow                 = 'Mô hình';
+$lang->custom->working              = 'Chế độ';
+$lang->custom->select               = 'Chọn mô hình';
+$lang->custom->branch               = 'Multi-Branch';
+$lang->custom->owner                = 'Sở hữu';
+$lang->custom->module               = 'Module';
+$lang->custom->section              = 'Section';
+$lang->custom->lang                 = 'Ngôn ngữ';
+$lang->custom->setPublic            = 'Thiết lập Public';
+$lang->custom->required             = 'Trường bắt buộc';
+$lang->custom->score                = 'Điểm';
+$lang->custom->timezone             = 'Timezone';
+$lang->custom->scoreReset           = 'Thiết lập lại điểm';
+$lang->custom->scoreTitle           = 'Tính năng điểm';
+$lang->custom->project              = $lang->sprintCommon;
+$lang->custom->product              = $lang->productCommon;
+$lang->custom->estimate             = 'Estimated configuration';
+$lang->custom->estimateConfig       = 'Estimated configuration';
+$lang->custom->estimateUnit         = 'Estimating Unit';
+$lang->custom->estimateEfficiency   = 'Productivity';
+$lang->custom->estimateCost         = 'Unit Labour Cost';
+$lang->custom->estimateHours        = 'Daily Working Hours';
+$lang->custom->estimateDays         = 'Working Days Per Week';
+$lang->custom->scaleFactor          = 'Conversion factor';
+$lang->custom->region               = 'Interval';
+$lang->custom->tips                 = 'Tips';
+$lang->custom->setTips              = 'Set Tips';
+$lang->custom->isRange              = 'Is Target Control';
+$lang->custom->concept              = "Concept";
+$lang->custom->URStory              = "User requirements";
+$lang->custom->SRStory              = "Software requirements";
+$lang->custom->epic                 = "Epic";
+$lang->custom->scrumStory           = "Story";
+$lang->custom->waterfallCommon      = "Waterfall";
+$lang->custom->buildin              = "Buildin";
+$lang->custom->isDefault            = 'Is Default';
+$lang->custom->editStoryConcept     = "Edit Story Concept";
+$lang->custom->setStoryConcept      = "Set Story Concept";
+$lang->custom->setDefaultConcept    = "Set Default Concept";
+$lang->custom->browseStoryConcept   = "List of story concepts";
+$lang->custom->deleteStoryConcept   = "Delete story Concept";
+$lang->custom->configureScrum       = "Scrum Model Custom";
+$lang->custom->URConcept            = "UR Concept";
+$lang->custom->SRConcept            = "SR Concept";
+$lang->custom->oneUnit              = "One {$lang->hourCommon}";
+$lang->custom->convertRelationTitle = "Conversion factor of {$lang->hourCommon} converted to %s";
 
 $lang->custom->unitList['efficiency'] = 'Working Hours/';
 $lang->custom->unitList['manhour']    = 'Man-hour/';
@@ -67,10 +68,11 @@ $lang->custom->tipCostList['CV']  = 'Cost Variance(CV%)';
 $lang->custom->tipRangeList[0]  = 'No';
 $lang->custom->tipRangeList[1]  = 'Yes';
 
-$lang->custom->regionMustNumber = 'The interval must be a number!';
-$lang->custom->tipNotEmpty      = 'The prompt can not be empty!';
-$lang->custom->currencyNotEmpty = 'You have to select one currency at least.';
-$lang->custom->defaultNotEmpty  = 'The default currency can not bu empty';
+$lang->custom->regionMustNumber    = 'The interval must be a number!';
+$lang->custom->tipNotEmpty         = 'The prompt can not be empty!';
+$lang->custom->currencyNotEmpty    = 'You have to select one currency at least.';
+$lang->custom->defaultNotEmpty     = 'The default currency can not bu empty';
+$lang->custom->convertRelationTips = "After {$lang->hourCommon} is converted to %s, historical data will be uniformly converted to %s";
 
 $lang->custom->numberError = 'The interval must be greater than zero!';
 
diff --git a/module/custom/lang/zh-cn.php b/module/custom/lang/zh-cn.php
index e7dba526ef..b45c4e001f 100644
--- a/module/custom/lang/zh-cn.php
+++ b/module/custom/lang/zh-cn.php
@@ -1,55 +1,56 @@
 <?php
-$lang->custom->common             = '自定义';
-$lang->custom->index              = '首页';
-$lang->custom->set                = '自定义配置';
-$lang->custom->restore            = '恢复默认';
-$lang->custom->key                = '键';
-$lang->custom->value              = '值';
-$lang->custom->flow               = '流程';
-$lang->custom->working            = '工作方式';
-$lang->custom->select             = '请选择流程：';
-$lang->custom->branch             = '多分支';
-$lang->custom->owner              = '所有者';
-$lang->custom->module             = '模块';
-$lang->custom->section            = '附加部分';
-$lang->custom->lang               = '所属语言';
-$lang->custom->setPublic          = '设为公共';
-$lang->custom->required           = '必填项';
-$lang->custom->score              = '积分';
-$lang->custom->timezone           = '时区';
-$lang->custom->scoreReset         = '重置积分';
-$lang->custom->scoreTitle         = '积分功能';
-$lang->custom->project            = $lang->sprintCommon;
-$lang->custom->product            = $lang->productCommon;
-$lang->custom->estimate           = '估算配置';
-$lang->custom->estimateConfig     = '估算配置';
-$lang->custom->estimateUnit       = '估算单位';
-$lang->custom->estimateEfficiency = '生产率';
-$lang->custom->estimateCost       = '单位人工成本';
-$lang->custom->estimateHours      = '每日工时';
-$lang->custom->estimateDays       = '每周工作天数';
-$lang->custom->convertRelations   = '换算关系';
-$lang->custom->region             = '区间';
-$lang->custom->tips               = '提示语';
-$lang->custom->setTips            = '设置提示语';
-$lang->custom->isRange            = '是否目标控制范围';
-$lang->custom->concept            = "项目概念";
-$lang->custom->URStory            = "用户需求";
-$lang->custom->SRStory            = "软件需求";
-$lang->custom->epic               = "史诗";
-$lang->custom->scrumStory         = "故事";
-$lang->custom->waterfallCommon    = "瀑布";
-$lang->custom->buildin            = "系统内置";
-$lang->custom->isDefault          = '是否默认';
-$lang->custom->editStoryConcept   = "编辑需求概念";
-$lang->custom->setStoryConcept    = "设置需求概念";
-$lang->custom->setDefaultConcept  = "设置默认概念";
-$lang->custom->browseStoryConcept = "需求概念列表";
-$lang->custom->deleteStoryConcept = "删除需求概念";
-$lang->custom->configureScrum     = "敏捷模型自定义";
-$lang->custom->URConcept          = "用需概念";
-$lang->custom->SRConcept          = "软需概念";
-$lang->custom->one                = "一个";
+$lang->custom->common               = '自定义';
+$lang->custom->index                = '首页';
+$lang->custom->set                  = '自定义配置';
+$lang->custom->restore              = '恢复默认';
+$lang->custom->key                  = '键';
+$lang->custom->value                = '值';
+$lang->custom->flow                 = '流程';
+$lang->custom->working              = '工作方式';
+$lang->custom->select               = '请选择流程：';
+$lang->custom->branch               = '多分支';
+$lang->custom->owner                = '所有者';
+$lang->custom->module               = '模块';
+$lang->custom->section              = '附加部分';
+$lang->custom->lang                 = '所属语言';
+$lang->custom->setPublic            = '设为公共';
+$lang->custom->required             = '必填项';
+$lang->custom->score                = '积分';
+$lang->custom->timezone             = '时区';
+$lang->custom->scoreReset           = '重置积分';
+$lang->custom->scoreTitle           = '积分功能';
+$lang->custom->project              = $lang->sprintCommon;
+$lang->custom->product              = $lang->productCommon;
+$lang->custom->estimate             = '估算配置';
+$lang->custom->estimateConfig       = '估算配置';
+$lang->custom->estimateUnit         = '估算单位';
+$lang->custom->estimateEfficiency   = '生产率';
+$lang->custom->estimateCost         = '单位人工成本';
+$lang->custom->estimateHours        = '每日工时';
+$lang->custom->estimateDays         = '每周工作天数';
+$lang->custom->scaleFactor          = '换算系数';
+$lang->custom->region               = '区间';
+$lang->custom->tips                 = '提示语';
+$lang->custom->setTips              = '设置提示语';
+$lang->custom->isRange              = '是否目标控制范围';
+$lang->custom->concept              = "项目概念";
+$lang->custom->URStory              = "用户需求";
+$lang->custom->SRStory              = "软件需求";
+$lang->custom->epic                 = "史诗";
+$lang->custom->scrumStory           = "故事";
+$lang->custom->waterfallCommon      = "瀑布";
+$lang->custom->buildin              = "系统内置";
+$lang->custom->isDefault            = '是否默认';
+$lang->custom->editStoryConcept     = "编辑需求概念";
+$lang->custom->setStoryConcept      = "设置需求概念";
+$lang->custom->setDefaultConcept    = "设置默认概念";
+$lang->custom->browseStoryConcept   = "需求概念列表";
+$lang->custom->deleteStoryConcept   = "删除需求概念";
+$lang->custom->configureScrum       = "敏捷模型自定义";
+$lang->custom->URConcept            = "用需概念";
+$lang->custom->SRConcept            = "软需概念";
+$lang->custom->oneUnit              = "一个{$lang->hourCommon}";
+$lang->custom->convertRelationTitle = "{$lang->hourCommon}转换为%s的换算系数";
 
 $lang->custom->unitList['efficiency'] = '工时/';
 $lang->custom->unitList['manhour']    = '人时/';
@@ -67,10 +68,11 @@ $lang->custom->tipCostList['CV']  = '成本偏差率(CV%)';
 $lang->custom->tipRangeList[0]  = '否';
 $lang->custom->tipRangeList[1]  = '是';
 
-$lang->custom->regionMustNumber = '区间必须是数字';
-$lang->custom->tipNotEmpty      = '提示语不能为空';
-$lang->custom->currencyNotEmpty = '至少选择一种货币';
-$lang->custom->defaultNotEmpty  = '默认货币不能为空';
+$lang->custom->regionMustNumber    = '区间必须是数字';
+$lang->custom->tipNotEmpty         = '提示语不能为空';
+$lang->custom->currencyNotEmpty    = '至少选择一种货币';
+$lang->custom->defaultNotEmpty     = '默认货币不能为空';
+$lang->custom->convertRelationTips = "{$lang->hourCommon}转换为%s后，历史数据将被统一转换为%s";
 
 $lang->custom->numberError = '区间必须大于零';
 
diff --git a/module/custom/view/estimate.html.php b/module/custom/view/estimate.html.php
index de13cf7456..279085dc3b 100644
--- a/module/custom/view/estimate.html.php
+++ b/module/custom/view/estimate.html.php
@@ -3,6 +3,10 @@
 <?php js::set('storyPoint', $lang->custom->conceptOptions->hourPoint[1]);?>
 <?php js::set('functionPoint', $lang->custom->conceptOptions->hourPoint[2]);?>
 <?php js::set('efficiency', $lang->custom->unitList['efficiency']);?>
+<?php js::set('convertRelationTitle', $lang->custom->convertRelationTitle);?>
+<?php js::set('convertRelationTips', $lang->custom->convertRelationTips);?>
+<?php js::set('notempty', sprintf($this->lang->error->notempty, $this->lang->custom->scaleFactor));?>
+<?php js::set('notNumber', sprintf($this->lang->error->float, $this->lang->custom->scaleFactor));?>
 <?php js::set('unit', $unit);?>
 <?php
 $lang->custom->object   = array();
@@ -11,6 +15,7 @@ $lang->custom->system[] = 'estimate';
 ?>
 <style>
 .unify-padding{width:94px;}
+#title{font-weight: 700;}
 </style>
 <div id='mainContent' class='main-row'>
   <div class='main-col main-content'>
@@ -26,17 +31,6 @@ $lang->custom->system[] = 'estimate';
           <td class='w-350px'><?php echo html::radio('hourPoint', $lang->custom->conceptOptions->estimateUnit, $unit);?></td>
           <td></td>
         </tr>
-        <tr class='hidden' id='convertRelations'>
-          <th class='w-150px'><?php echo $lang->custom->one . $lang->custom->conceptOptions->hourPoint[$unit];?></th>
-          <td>
-            <div class='input-group w-300px'>
-              <span class='input-group-addon'><?php echo "=";?></span>
-              <?php echo html::input('scaleFactor', $scaleFactor, "class='form-control' required");?>
-              <span class='input-group-addon unify-padding'></span>
-            </div>
-          </td>
-          <td></td>
-        </tr>
         <?php $hidden = $unit == 0 ? 'hidden' : '';?>
         <tr class="efficiency <?php echo $hidden;?>">
           <th class='w-150px'><?php echo $lang->custom->estimateEfficiency;?></th>
@@ -98,10 +92,48 @@ $lang->custom->system[] = 'estimate';
           <td></td>
         </tr>
         <tr>
-          <td colspan='2' class='text-center'><?php echo html::submitButton();?></td>
+          <td colspan='2' class='text-center'>
+            <?php echo html::hidden('scaleFactor', '')?>
+            <?php echo html::submitButton();?>
+          </td>
         </tr>
       </table>
     </form>
   </div>
 </div>
+<div class="modal fade" id="convertRelations">
+  <div class="modal-dialog mw-500px">
+    <div class="modal-content">
+      <div class="modal-header">
+        <h4 class="modal-title" id='title'><?php echo $lang->custom->convertRelationTitle;?></h4>
+      </div>
+      <div class="modal-body">
+        <form>
+          <table class='table table-form'>
+            <tr>
+              <th class='w-80px'><?php echo $lang->custom->oneUnit;?></th>
+              <td>
+                <div class='input-group w-300px'>
+                  <span class='input-group-addon'><?php echo "=";?></span>
+                  <?php echo html::input('factor', $scaleFactor, "class='form-control' required");?>
+                  <span class='input-group-addon unify-padding'></span>
+                </div>
+              </td>
+            </tr>
+            <tr>
+              <td colspan='2'><div class='alert alert-info no-margin' id='tips'><?php echo $lang->custom->convertRelationTips;?></div></td>
+            </tr>
+            <tr>
+              <td colspan='2' class='text-center'>
+                <?php $gobackURL = $this->createLink('custom', 'estimate');?>
+                <?php echo html::commonButton($lang->save, 'onclick = "setScaleFactor();"', 'btn btn-primary btn-wide');?>
+                <?php echo html::a($gobackURL, $lang->goback, '', "class='btn btn-back btn-wide'");?>
+              </td>
+            </tr>
+          </table>
+        </form>
+      </div>
+    </div>
+  </div>
+</div>
 <?php include '../../common/view/footer.html.php';?>