diff --git a/module/story/js/common.js b/module/story/js/common.js
index f0481757a9..de732986ab 100644
--- a/module/story/js/common.js
+++ b/module/story/js/common.js
@@ -109,7 +109,8 @@ $('[data-toggle="popover"]').each(function(item) {
 
 function relieve(index)
 {
-    $.post(relieveURL, {storyID:storyID, siblingID:index}, function(data){
+    $.post(relieveURL, {siblingID: index}, function(data)
+    {
         $('[data-id="' + index + '"]').popover('hide');
 
         if(data.result == 'success')
diff --git a/module/story/lang/de.php b/module/story/lang/de.php
index 14c4e80eb5..503a183021 100644
--- a/module/story/lang/de.php
+++ b/module/story/lang/de.php
@@ -99,12 +99,14 @@ $lang->story->successToTask    = "Converted to task.";
 $lang->story->storyRound       = '%s time estimation';
 $lang->story->float            = "『%s』should be positive number, decimals included.";
 $lang->story->saveDraftSuccess = 'Save as draft succeeded.';
-$lang->story->changeSyncTip    = "The modification of this story will be synchronized to the following twin requirements";
-$lang->story->syncTip          = "The twin story are synchronized except for product, branch, module, plan, and stage. After the twin relationship is dissolved, they are no longer synchronized.";
-$lang->story->relievedTip      = "The twin relationship cannot be restored after dissolving, the content of the demand is no longer synchronized, whether to dissolving?";
-$lang->story->assignSyncTip    = "Both twin stories modify the assignor synchronously";
-$lang->story->closeSyncTip     = "Twin stories are closed synchronously";
-$lang->story->activateSyncTip  = "Twin stories are activated synchronously";
+
+$lang->story->changeSyncTip       = "The modification of this story will be synchronized to the following twin requirements";
+$lang->story->syncTip             = "The twin story are synchronized except for product, branch, module, plan, and stage. After the twin relationship is dissolved, they are no longer synchronized.";
+$lang->story->relievedTip         = "The twin relationship cannot be restored after dissolving, the content of the demand is no longer synchronized, whether to dissolving?";
+$lang->story->assignSyncTip       = "Both twin stories modify the assignor synchronously";
+$lang->story->closeSyncTip        = "Twin stories are closed synchronously";
+$lang->story->activateSyncTip     = "Twin stories are activated synchronously";
+$lang->story->relievedSiblingsTip = "After product adjustment, the twin relationship of this story will be automatically removed, and the story will no longer be synchronized. Do you want to save?";
 
 $lang->story->id               = 'ID';
 $lang->story->parent           = 'Parent';
@@ -483,6 +485,7 @@ $lang->story->operateList['closed']    = 'closed';
 $lang->story->operateList['activated'] = 'activated';
 $lang->story->operateList['changed']   = 'changed';
 $lang->story->operateList['reviewed']  = 'reviewed';
+$lang->story->operateList['edited']    = 'edited';
 
 $lang->requirement->common             = $lang->URCommon;
 $lang->requirement->create             = 'Create Requirement';
diff --git a/module/story/lang/en.php b/module/story/lang/en.php
index 4de2c96313..7c16cd5314 100644
--- a/module/story/lang/en.php
+++ b/module/story/lang/en.php
@@ -99,12 +99,14 @@ $lang->story->successToTask    = "Converted to task.";
 $lang->story->storyRound       = '%s time estimation';
 $lang->story->float            = "『%s』should have positive number, or decimals.";
 $lang->story->saveDraftSuccess = 'Save as draft succeeded.';
-$lang->story->changeSyncTip    = "The modification of this story will be synchronized to the following twin requirements";
-$lang->story->syncTip          = "The twin story are synchronized except for product, branch, module, plan, and stage. After the twin relationship is dissolved, they are no longer synchronized.";
-$lang->story->relievedTip      = "The twin relationship cannot be restored after dissolving, the content of the demand is no longer synchronized, whether to dissolving?";
-$lang->story->assignSyncTip    = "Both twin stories modify the assignor synchronously";
-$lang->story->closeSyncTip     = "Twin stories are closed synchronously";
-$lang->story->activateSyncTip  = "Twin stories are activated synchronously";
+
+$lang->story->changeSyncTip       = "The modification of this story will be synchronized to the following twin requirements";
+$lang->story->syncTip             = "The twin story are synchronized except for product, branch, module, plan, and stage. After the twin relationship is dissolved, they are no longer synchronized.";
+$lang->story->relievedTip         = "The twin relationship cannot be restored after dissolving, the content of the demand is no longer synchronized, whether to dissolving?";
+$lang->story->assignSyncTip       = "Both twin stories modify the assignor synchronously";
+$lang->story->closeSyncTip        = "Twin stories are closed synchronously";
+$lang->story->activateSyncTip     = "Twin stories are activated synchronously";
+$lang->story->relievedSiblingsTip = "After product adjustment, the twin relationship of this story will be automatically removed, and the story will no longer be synchronized. Do you want to save?";
 
 $lang->story->id               = 'ID';
 $lang->story->parent           = 'Parent';
@@ -483,6 +485,7 @@ $lang->story->operateList['closed']    = 'closed';
 $lang->story->operateList['activated'] = 'activated';
 $lang->story->operateList['changed']   = 'changed';
 $lang->story->operateList['reviewed']  = 'reviewed';
+$lang->story->operateList['edited']    = 'edited';
 
 $lang->requirement->common             = $lang->URCommon;
 $lang->requirement->create             = 'Create Requirement';
diff --git a/module/story/lang/fr.php b/module/story/lang/fr.php
index df1111501f..2d8ef45343 100644
--- a/module/story/lang/fr.php
+++ b/module/story/lang/fr.php
@@ -99,12 +99,14 @@ $lang->story->successToTask    = "Converted to task.";
 $lang->story->storyRound       = '%s time estimation';
 $lang->story->float            = "『 %s 』doit avoir des nombres positifs ou décimaux.";
 $lang->story->saveDraftSuccess = 'Save as draft succeeded.';
-$lang->story->changeSyncTip    = "The modification of this story will be synchronized to the following twin requirements";
-$lang->story->syncTip          = "The twin story are synchronized except for product, branch, module, plan, and stage. After the twin relationship is dissolved, they are no longer synchronized.";
-$lang->story->relievedTip      = "The twin relationship cannot be restored after dissolving, the content of the demand is no longer synchronized, whether to dissolving?";
-$lang->story->assignSyncTip    = "Both twin stories modify the assignor synchronously";
-$lang->story->closeSyncTip     = "Twin stories are closed synchronously";
-$lang->story->activateSyncTip  = "Twin stories are activated synchronously";
+
+$lang->story->changeSyncTip       = "The modification of this story will be synchronized to the following twin requirements";
+$lang->story->syncTip             = "The twin story are synchronized except for product, branch, module, plan, and stage. After the twin relationship is dissolved, they are no longer synchronized.";
+$lang->story->relievedTip         = "The twin relationship cannot be restored after dissolving, the content of the demand is no longer synchronized, whether to dissolving?";
+$lang->story->assignSyncTip       = "Both twin stories modify the assignor synchronously";
+$lang->story->closeSyncTip        = "Twin stories are closed synchronously";
+$lang->story->activateSyncTip     = "Twin stories are activated synchronously";
+$lang->story->relievedSiblingsTip = "After product adjustment, the twin relationship of this story will be automatically removed, and the story will no longer be synchronized. Do you want to save?";
 
 $lang->story->id               = 'ID';
 $lang->story->parent           = 'Parent';
@@ -483,6 +485,7 @@ $lang->story->operateList['closed']    = 'closed';
 $lang->story->operateList['activated'] = 'activated';
 $lang->story->operateList['changed']   = 'changed';
 $lang->story->operateList['reviewed']  = 'reviewed';
+$lang->story->operateList['edited']    = 'edited';
 
 $lang->requirement->common             = $lang->URCommon;
 $lang->requirement->create             = 'Create Requirement';
diff --git a/module/story/lang/vi.php b/module/story/lang/vi.php
index cd8ced45fd..591d98b0ae 100644
--- a/module/story/lang/vi.php
+++ b/module/story/lang/vi.php
@@ -93,11 +93,13 @@ $lang->story->successToTask    = "Converted to task.";
 $lang->story->storyRound       = '%s time estimation';
 $lang->story->float            = "『%s』should be positive number, decimals included.";
 $lang->story->saveDraftSuccess = 'Save as draft succeeded.';
-$lang->story->changeSyncTip    = "The modification of this story will be synchronized to the following twin requirements";
-$lang->story->syncTip          = "The twin story are synchronized except for product, branch, module, plan, and stage. After the twin relationship is dissolved, they are no longer synchronized.";
-$lang->story->assignSyncTip    = "Both twin stories modify the assignor synchronously";
-$lang->story->closeSyncTip     = "Twin stories are closed synchronously";
-$lang->story->activateSyncTip  = "Twin stories are activated synchronously";
+
+$lang->story->changeSyncTip       = "The modification of this story will be synchronized to the following twin requirements";
+$lang->story->syncTip             = "The twin story are synchronized except for product, branch, module, plan, and stage. After the twin relationship is dissolved, they are no longer synchronized.";
+$lang->story->assignSyncTip       = "Both twin stories modify the assignor synchronously";
+$lang->story->closeSyncTip        = "Twin stories are closed synchronously";
+$lang->story->activateSyncTip     = "Twin stories are activated synchronously";
+$lang->story->relievedSiblingsTip = "After product adjustment, the twin relationship of this story will be automatically removed, and the story will no longer be synchronized. Do you want to save?";
 
 $lang->story->id             = 'ID';
 $lang->story->parent         = 'Mẹ';
@@ -470,3 +472,4 @@ $lang->story->operateList['closed']    = 'closed';
 $lang->story->operateList['activated'] = 'activated';
 $lang->story->operateList['changed']   = 'changed';
 $lang->story->operateList['reviewed']  = 'reviewed';
+$lang->story->operateList['edited']    = 'edited';
diff --git a/module/story/lang/zh-cn.php b/module/story/lang/zh-cn.php
index 4d522d9645..4380f85915 100644
--- a/module/story/lang/zh-cn.php
+++ b/module/story/lang/zh-cn.php
@@ -99,12 +99,14 @@ $lang->story->successToTask    = '批量转任务成功';
 $lang->story->storyRound       = '第 %s 轮估算';
 $lang->story->float            = "『%s』应当是正数，可以是小数。";
 $lang->story->saveDraftSuccess = '存为草稿成功';
-$lang->story->changeSyncTip    = "该需求的修改会同步到如下的孪生需求";
-$lang->story->syncTip          = "孪生需求间除产品、分支 、模块、计划、阶段外均同步，孪生关系解除后不再同步";
-$lang->story->relievedTip      = "孪生关系解除后无法恢复，需求的内容不再同步，是否解除？";
-$lang->story->assignSyncTip    = "孪生需求均同步修改指派人";
-$lang->story->closeSyncTip     = "孪生需求均同步关闭";
-$lang->story->activateSyncTip  = "孪生需求均同步激活";
+
+$lang->story->changeSyncTip       = "该需求的修改会同步到如下的孪生需求";
+$lang->story->syncTip             = "孪生需求间除产品、分支 、模块、计划、阶段外均同步，孪生关系解除后不再同步";
+$lang->story->relievedTip         = "孪生关系解除后无法恢复，需求的内容不再同步，是否解除？";
+$lang->story->assignSyncTip       = "孪生需求均同步修改指派人";
+$lang->story->closeSyncTip        = "孪生需求均同步关闭";
+$lang->story->activateSyncTip     = "孪生需求均同步激活";
+$lang->story->relievedSiblingsTip = '产品调整后，本需求自动解除孪生关系，需求不再同步，是否保存？';
 
 $lang->story->id               = '编号';
 $lang->story->parent           = '父需求';
@@ -483,6 +485,7 @@ $lang->story->operateList['closed']    = '关闭';
 $lang->story->operateList['activated'] = '激活';
 $lang->story->operateList['changed']   = '变更';
 $lang->story->operateList['reviewed']  = '评审';
+$lang->story->operateList['edited']    = '编辑';
 
 $lang->requirement->common             = $lang->URCommon;
 $lang->requirement->create             = "提{$lang->URCommon}";
diff --git a/module/story/model.php b/module/story/model.php
index 9e4f359820..5cf8b3f3e1 100644
--- a/module/story/model.php
+++ b/module/story/model.php
@@ -910,6 +910,14 @@ class storyModel extends model
             ->remove('files,labels,comment,contactListMenu,stages,reviewer,needNotReview')
             ->get();
 
+        /* Relieve siblings when change product. */
+        if(!empty($oldStory->siblings) and $story->product != $oldStory->product)
+        {
+            $this->dbh->exec("UPDATE " . TABLE_STORY . " SET siblings = REPLACE(siblings, ',$storyID,', ',') WHERE `product` = $oldStory->product");
+            $this->dao->update(TABLE_STORY)->set('siblings')->eq('')->where('id')->eq($storyID)->orWhere('siblings')->eq(',')->exec();
+            $oldStory->siblings = '';
+        }
+
         if($oldStory->type == 'story' and !isset($story->linkStories)) $story->linkStories = '';
         if($oldStory->type == 'requirement' and !isset($story->linkRequirements)) $story->linkRequirements = '';
         if($oldStory->status == 'changing' and $story->status == 'draft') $story->status = 'changing';
@@ -961,6 +969,19 @@ class storyModel extends model
                 ->beginIF($oldStory->status == 'reviewing')->andWhere('reviewer')->notin(implode(',', $_POST['reviewer']))
                 ->exec();
 
+            /* Sync siblings. */
+            if(!empty($oldStory->siblings))
+            {
+                foreach(explode(',', trim($oldStory->siblings, ',')) as $siblingID)
+                {
+                    $this->dao->delete()->from(TABLE_STORYREVIEW)
+                        ->where('story')->eq($siblingID)
+                        ->andWhere('version')->eq($oldStory->version)
+                        ->beginIF($oldStory->status == 'reviewing')->andWhere('reviewer')->notin(implode(',', $_POST['reviewer']))
+                        ->exec();
+                }
+            }
+
             foreach($_POST['reviewer'] as $reviewer)
             {
                 if($oldStory->status == 'reviewing' and in_array($reviewer, array_keys($oldReviewer))) continue;
@@ -970,6 +991,16 @@ class storyModel extends model
                 $reviewData->version  = $oldStory->version;
                 $reviewData->reviewer = $reviewer;
                 $this->dao->insert(TABLE_STORYREVIEW)->data($reviewData)->exec();
+
+                /* Sync siblings. */
+                if(!empty($oldStory->siblings))
+                {
+                    foreach(explode(',', trim($oldStory->siblings, ',')) as $siblingID)
+                    {
+                        $reviewData->story = $siblingID;
+                        $this->dao->insert(TABLE_STORYREVIEW)->data($reviewData)->exec();
+                    }
+                }
             }
 
             if($oldStory->status == 'reviewing') $story = $this->updateStoryByReview($storyID, $oldStory, $story);
@@ -1007,6 +1038,18 @@ class storyModel extends model
                 $data->verify = $story->verify;
                 $data->files  = $story->files = $addedFiles . trim($storyFiles, ',');
                 $this->dao->update(TABLE_STORYSPEC)->data($data)->where('story')->eq((int)$storyID)->andWhere('version')->eq($oldStory->version)->exec();
+
+                /* Sync siblings. */
+                if(!empty($oldStory->siblings))
+                {
+                    foreach(explode(',', trim($oldStory->siblings, ',')) as $siblingID)
+                    {
+                        $this->dao->update(TABLE_STORYSPEC)->data($data)
+                            ->where('story')->eq((int)$siblingID)
+                            ->andWhere('version')->eq($oldStory->version)
+                            ->exec();
+                    }
+                }
             }
 
             if($story->product != $oldStory->product)
@@ -1136,6 +1179,8 @@ class storyModel extends model
                 if(isset($story->finalResult)) $this->recordReviewAction($story);
             }
 
+            if(!empty($oldStory->siblings)) $this->syncSiblings($oldStory->id, $oldStory->siblings, $changes, 'Edited');
+
             return true;
         }
     }
@@ -1549,14 +1594,26 @@ class storyModel extends model
         /* Fix bug #671. */
         $this->lang->story->closedReason = $this->lang->story->rejectedReason;
 
-        $this->dao->update(TABLE_STORYREVIEW)->set('result')->eq($this->post->result)->set('reviewDate')->eq($now)->where('story')->eq($storyID)->andWhere('version')->eq($oldStory->version)->andWhere('reviewer')->eq($this->app->user->account)->exec();
+        $this->dao->update(TABLE_STORYREVIEW)
+            ->set('result')->eq($this->post->result)
+            ->set('reviewDate')->eq($now)
+            ->where('story')->eq($storyID)
+            ->andWhere('version')->eq($oldStory->version)
+            ->andWhere('reviewer')->eq($this->app->user->account)
+            ->exec();
 
         /* Sync siblings. */
         if(!empty($oldStory->siblings))
         {
             foreach(explode(',', trim($oldStory->siblings, ',')) as $siblingID)
             {
-                $this->dao->update(TABLE_STORYREVIEW)->set('result')->eq($this->post->result)->set('reviewDate')->eq($now)->where('story')->eq($siblingID)->andWhere('version')->eq($oldStory->version)->andWhere('reviewer')->eq($this->app->user->account)->exec();
+                $this->dao->update(TABLE_STORYREVIEW)
+                    ->set('result')->eq($this->post->result)
+                    ->set('reviewDate')->eq($now)
+                    ->where('story')->eq($siblingID)
+                    ->andWhere('version')->eq($oldStory->version)
+                    ->andWhere('reviewer')->eq($this->app->user->account)
+                    ->exec();
             }
         }
 
@@ -6211,6 +6268,8 @@ class storyModel extends model
             $syncFieldList[$fieldName] = $fieldValue;
         }
 
+        if(empty($syncFieldList)) return;
+
         /* Synchronize and record dynamics. */
         $this->loadModel('action');
         $siblings = explode(',', trim($siblings, ','));
diff --git a/module/story/view/edit.html.php b/module/story/view/edit.html.php
index b2065d0f61..f0affe9be5 100644
--- a/module/story/view/edit.html.php
+++ b/module/story/view/edit.html.php
@@ -24,6 +24,8 @@
 <?php js::set('feedbackSource', $config->story->feedbackSource); ?>
 <?php js::set('storyStatus', $story->status);?>
 <?php js::set('lastReviewer', explode(',', $lastReviewer))?>
+<?php js::set('siblings', $story->siblings)?>
+<?php js::Set('relievedSiblingsTip', $lang->story->relievedSiblingsTip)?>
 <div class='main-content' id='mainContent'>
   <form method='post' enctype='multipart/form-data' target='hiddenwin' id='dataform'>
     <div class='main-header'>
diff --git a/module/story/view/header.html.php b/module/story/view/header.html.php
index 5e72a353b0..769e6aec09 100644
--- a/module/story/view/header.html.php
+++ b/module/story/view/header.html.php
@@ -11,6 +11,17 @@
  */
 function loadProduct(productID)
 {
+    if(siblings && productID != oldProductID)
+    {
+        confirmRelievedSiblings = confirm(relievedSiblingsTip);
+        if(!confirmRelievedSiblings)
+        {
+            $('#product').val(oldProductID);
+            $('#product').trigger("chosen:updated");
+            return false;
+        }
+    }
+
     if(typeof parentStory != 'undefined' && parentStory)
     {
         confirmLoadProduct = confirm(moveChildrenTips);