diff --git a/module/project/control.php b/module/project/control.php
index 8a7db95168..3906655e35 100644
--- a/module/project/control.php
+++ b/module/project/control.php
@@ -482,6 +482,8 @@ class project extends control
      */
     public function importBug($projectID = 0, $browseType = 'all', $param = 0, $recTotal = 0, $recPerPage = 30, $pageID = 1)
     {
+        $this->app->loadConfig('task');
+
         if(!empty($_POST))
         {
             $mails = $this->project->importBug($projectID);
@@ -605,17 +607,18 @@ class project extends control
         $this->loadModel('search')->setSearchParams($this->config->bug->search);
 
         /* Assign. */
-        $this->view->title      = $title;
-        $this->view->position   = $position;
-        $this->view->pager      = $pager;
-        $this->view->bugs       = $bugs;
-        $this->view->recTotal   = $pager->recTotal;
-        $this->view->recPerPage = $pager->recPerPage;
-        $this->view->browseType = $browseType;
-        $this->view->param      = $param;
-        $this->view->users      = $users;
-        $this->view->project    = $this->project->getByID($projectID);
-        $this->view->projectID  = $projectID;
+        $this->view->title          = $title;
+        $this->view->position       = $position;
+        $this->view->pager          = $pager;
+        $this->view->bugs           = $bugs;
+        $this->view->recTotal       = $pager->recTotal;
+        $this->view->recPerPage     = $pager->recPerPage;
+        $this->view->browseType     = $browseType;
+        $this->view->param          = $param;
+        $this->view->users          = $users;
+        $this->view->project        = $this->project->getByID($projectID);
+        $this->view->projectID      = $projectID;
+        $this->view->requiredFields = explode(',', $this->config->task->create->requiredFields);
         $this->display();
     }
 
diff --git a/module/project/model.php b/module/project/model.php
index b4ebb7c0f8..e6a9eb8e15 100644
--- a/module/project/model.php
+++ b/module/project/model.php
@@ -1468,12 +1468,20 @@ class projectModel extends model
         $showAllModule = isset($this->config->project->task->allModule) ? $this->config->project->task->allModule : '';
         $modules       = $this->loadModel('tree')->getTaskOptionMenu($projectID, 0, 0, $showAllModule ? 'allModule' : '');
 
+        $project        = $this->getByID($projectID);
+        $requiredFields = ',' . $this->config->task->create->requiredFields . ',';
+        if($project->type == 'ops') $requiredFields = str_replace(',story,', ',', $requiredFields);
+        $requiredFields = trim($requiredFields, ',');
+
         $bugToTasks = fixer::input('post')->get();
         $bugs       = $this->bug->getByList(array_keys($bugToTasks->import));
         foreach($bugToTasks->import as $key => $value)
         {
-            $bug  = $bugs[$key];
+            $bug = zget($bugs, $key, '');
+            if(empty($bug)) continue;
+
             $task = new stdClass();
+            $task->bug          = $bug;
             $task->project      = $projectID;
             $task->story        = $bug->story;
             $task->storyVersion = $bug->storyVersion;
@@ -1483,22 +1491,50 @@ class projectModel extends model
             $task->type         = 'devel';
             $task->pri          = $bugToTasks->pri[$key];
             $task->deadline     = $bugToTasks->deadline[$key];
+            $task->estimate     = $bugToTasks->estimate[$key];
             $task->consumed     = 0;
+            $task->assignedTo   = '';
             $task->status       = 'wait';
             $task->openedDate   = $now;
             $task->openedBy     = $this->app->user->account;
-            if(!empty($bugToTasks->estimate[$key]))
-            {
-                $task->estimate     = $bugToTasks->estimate[$key];
-                $task->left         = $task->estimate;
-            }
+
+            if($task->estimate !== '') $task->left = $task->estimate;
+            if(strpos($requiredFields, 'deadline') !== false and $task->deadline == '0000-00-00') $task->deadline = '';
             if(!empty($bugToTasks->assignedTo[$key]))
             {
                 $task->assignedTo   = $bugToTasks->assignedTo[$key];
                 $task->assignedDate = $now;
             }
+
+            /* Check task required fields. */
+            foreach(explode(',', $requiredFields) as $field)
+            {
+                if(empty($field))         continue;
+                if(!isset($task->$field)) continue;
+                if(!empty($task->$field)) continue;
+
+                if($field == 'estimate' and strlen(trim($task->estimate)) != 0) continue;
+
+                dao::$errors['message'][] = sprintf($this->lang->error->notempty, $this->lang->task->$field);
+                return false;
+            }
+
+            if(!preg_match("/^[0-9]+(.[0-9]{1,3})?$/", $task->estimate))
+            {
+                dao::$errors['message'][] = $this->lang->task->error->estimateNumber;
+                return false;
+            }
+
+            $tasks[$key] = $task;
+        }
+
+        foreach($tasks as $key => $task)
+        {
+            $bug = $task->bug;
+            unset($task->bug);
+
             if(!$bug->confirmed) $this->dao->update(TABLE_BUG)->set('confirmed')->eq(1)->where('id')->eq($bug->id)->exec();
-            $this->dao->insert(TABLE_TASK)->data($task)->checkIF($bugToTasks->estimate[$key] != '', 'estimate', 'float')->exec();
+            $this->dao->insert(TABLE_TASK)->data($task)->checkIF($task->estimate != '', 'estimate', 'float')->exec();
 
             if(dao::isError())
             {
diff --git a/module/project/view/importbug.html.php b/module/project/view/importbug.html.php
index 0331266986..edfa5f9cd5 100755
--- a/module/project/view/importbug.html.php
+++ b/module/project/view/importbug.html.php
@@ -27,7 +27,7 @@ var browseType = '<?php echo $browseType;?>';
     <div id='queryBox' data-module='importBug' class='show'></div>
   </div>
   <form class='main-table' method='post' target='hiddenwin' id='importBugForm' data-ride='table'>
-    <table class='table has-sort-head table-fixed'>
+    <table class='table table-form has-sort-head table-fixed'>
       <thead>
         <tr>
           <th class='c-id'>
@@ -40,10 +40,10 @@ var browseType = '<?php echo $browseType;?>';
           <th class='w-pri'>      <?php echo $lang->priAB;?></th>
           <th><?php echo $lang->bug->title;?></th>
           <th class='w-80px'><?php echo $lang->bug->statusAB;?></th>
-          <th class='w-100px'><?php echo $lang->task->pri;?></th>
-          <th class='w-150px'><?php echo $lang->task->assignedTo;?></th>
-          <th class='w-80px'><?php echo $lang->task->estimate;?></th>
-          <th class='w-120px'><?php echo $lang->task->deadline;?></th>
+          <th class='w-100px <?php echo in_array('pri',        $requiredFields) ? 'required' : ''?>'><?php echo $lang->task->pri;?></th>
+          <th class='w-150px <?php echo in_array('assignedTo', $requiredFields) ? 'required' : ''?>'><?php echo $lang->task->assignedTo;?></th>
+          <th class='w-80px  <?php echo in_array('estimate',   $requiredFields) ? 'required' : ''?>'><?php echo $lang->task->estimate;?></th>
+          <th class='w-120px <?php echo in_array('deadline',   $requiredFields) ? 'required' : ''?>'><?php echo $lang->task->deadline;?></th>
         </tr>
       </thead>
       <tbody>
diff --git a/module/task/lang/de.php b/module/task/lang/de.php
index f1d09af03a..fc97606bba 100644
--- a/module/task/lang/de.php
+++ b/module/task/lang/de.php
@@ -201,6 +201,7 @@ $lang->task->error = new stdclass();
 $lang->task->error->totalNumber      = '"Total Cost" must be numbers.';
 $lang->task->error->consumedNumber   = '"Verbraucht" muss eine Zahl sein.';
 $lang->task->error->estimateNumber   = '"Stunden" müss eine Zahl sein.';
+$lang->task->error->leftNumber       = '"Left" must be numbers.';
 $lang->task->error->recordMinus      = 'Work hours should not be negative number.';
 $lang->task->error->consumedSmall    = '"Genutzt" muss larger than before.';
 $lang->task->error->consumedThisTime = 'Bitte geben Sie die Stunden an';
diff --git a/module/task/lang/en.php b/module/task/lang/en.php
index c60acf7ba3..02c190d90b 100644
--- a/module/task/lang/en.php
+++ b/module/task/lang/en.php
@@ -201,6 +201,7 @@ $lang->task->error = new stdclass();
 $lang->task->error->totalNumber      = '"Total Cost" must be numbers.';
 $lang->task->error->consumedNumber   = '"Current Cost" must be numbers.';
 $lang->task->error->estimateNumber   = '"Estimates" must be numbers.';
+$lang->task->error->leftNumber       = '"Left" must be numbers.';
 $lang->task->error->recordMinus      = 'Work hours should not be negative number.';
 $lang->task->error->consumedSmall    = '"Total Cost" must be > the last number.';
 $lang->task->error->consumedThisTime = 'Please enter "Hours Cost"';
diff --git a/module/task/lang/fr.php b/module/task/lang/fr.php
index 2f424052e4..0e8a7c94cb 100644
--- a/module/task/lang/fr.php
+++ b/module/task/lang/fr.php
@@ -201,6 +201,7 @@ $lang->task->error = new stdclass();
 $lang->task->error->totalNumber      = '"Total Cost" must be numbers.';
 $lang->task->error->consumedNumber   = '"Coût" doit être numérique.';
 $lang->task->error->estimateNumber   = '"Estimé" doit être numérique.';
+$lang->task->error->leftNumber       = '"Entrez" doit être numérique.';
 $lang->task->error->recordMinus      = 'Work hours should not be negative number.';
 $lang->task->error->consumedSmall    = '"Coût Total" doit être > au dernier chiffre.';
 $lang->task->error->consumedThisTime = 'Entrez le "Coût en Heures"';
diff --git a/module/task/lang/vi.php b/module/task/lang/vi.php
index 575a36f394..4d2f18da86 100644
--- a/module/task/lang/vi.php
+++ b/module/task/lang/vi.php
@@ -201,6 +201,7 @@ $lang->task->error = new stdclass();
 $lang->task->error->totalNumber      = '"Total Cost" must be numbers.';
 $lang->task->error->consumedNumber   = '"Giờ làm" phải là số.';
 $lang->task->error->estimateNumber   = '"Dự tính" phải là số.';
+$lang->task->error->leftNumber       = '"Left" must be numbers.';
 $lang->task->error->recordMinus      = 'Giờ làm không nên là số âm';
 $lang->task->error->consumedSmall    = '"Tổng giờ làm" phải là > số cuối cùng.';
 $lang->task->error->consumedThisTime = 'Vui lòng nhập "Số giờ làm"';
diff --git a/module/task/lang/zh-cn.php b/module/task/lang/zh-cn.php
index 727e17b0c9..e4914e0396 100644
--- a/module/task/lang/zh-cn.php
+++ b/module/task/lang/zh-cn.php
@@ -200,7 +200,8 @@ $lang->task->cannotDeleteParent    = '不能删除父任务。';
 $lang->task->error                   = new stdclass();
 $lang->task->error->totalNumber      = '"总计消耗"必须为数字';
 $lang->task->error->consumedNumber   = '"本次消耗"必须为数字';
-$lang->task->error->estimateNumber   = '"预计剩余"必须为数字';
+$lang->task->error->estimateNumber   = '"最初预计"必须为数字';
+$lang->task->error->leftNumber       = '"预计剩余"必须为数字';
 $lang->task->error->recordMinus      = '工时不能为负数';
 $lang->task->error->consumedSmall    = '"总计消耗"必须大于之前消耗';
 $lang->task->error->consumedThisTime = '请填写"工时"';
diff --git a/module/task/model.php b/module/task/model.php
index 34e1b10230..f6910a4402 100644
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -1296,7 +1296,7 @@ class taskModel extends model
         foreach($record->consumed as $id => $item) $record->consumed[$id] = trim($item);
         foreach($record->left     as $id => $item) $record->left[$id]     = trim($item);
         foreach($record->consumed as $id => $item) if(!is_numeric($item) and !empty($item)) dao::$errors[] = 'ID #' . $id . ' ' . $this->lang->task->error->totalNumber;
-        foreach($record->left     as $id => $item) if(!is_numeric($item) and !empty($item)) dao::$errors[] = 'ID #' . $id . ' ' . $this->lang->task->error->estimateNumber;
+        foreach($record->left     as $id => $item) if(!is_numeric($item) and !empty($item)) dao::$errors[] = 'ID #' . $id . ' ' . $this->lang->task->error->leftNumber;
         if(dao::isError()) return false;
 
         $estimates    = array();
@@ -1647,7 +1647,7 @@ class taskModel extends model
 
         if(!is_numeric($task->left))
         {
-            dao::$errors[] = $this->lang->task->error->estimateNumber;
+            dao::$errors[] = $this->lang->task->error->leftNumber;
             return false;
         }