diff --git a/module/task/js/create.js b/module/task/js/create.js
index 97d82d4e63..a88a1c8861 100644
--- a/module/task/js/create.js
+++ b/module/task/js/create.js
@@ -16,12 +16,14 @@ function setOwners(result)
         $('#assignedTo').attr('multiple', 'multiple');
         $('#assignedTo').chosen('destroy');
         $('#assignedTo').chosen(defaultChosenOptions);
+        $('#selectAllUser').removeClass('hidden');
     }
     else if($('#assignedTo').attr('multiple') == 'multiple')
     {
         $('#assignedTo').removeAttr('multiple');
         $('#assignedTo').chosen('destroy');
         $('#assignedTo').chosen(defaultChosenOptions);
+        $('#selectAllUser').addClass('hidden');
     }
 }
 
@@ -124,4 +126,14 @@ $(document).ready(function()
 {
     setPreview();
     $("#story, #mailto").chosen(defaultChosenOptions);
+
+    $('#selectAllUser').on('click', function()
+    {
+        var $assignedTo = $('#assignedTo');
+        if($assignedTo.attr('multiple')) 
+        {
+            $assignedTo.children('option').attr('selected', 'selected');
+            $assignedTo.trigger('chosen:updated');
+        }
+    });
 });
diff --git a/module/task/lang/en.php b/module/task/lang/en.php
index 9865bdb9a0..945d8c6003 100644
--- a/module/task/lang/en.php
+++ b/module/task/lang/en.php
@@ -86,7 +86,8 @@ $lang->task->recordEstimate    = 'Hours';
 $lang->task->editEstimate      = 'Edit Hour';
 $lang->task->deleteEstimate    = 'Delete Hour';
 
-$lang->task->ditto = 'Ditto';
+$lang->task->ditto         = 'Ditto';
+$lang->task->selectAllUser = 'Select all user';
 
 $lang->task->statusList['']        = '';
 $lang->task->statusList['wait']    = 'Pending';
diff --git a/module/task/lang/zh-cn.php b/module/task/lang/zh-cn.php
index 3a767bc103..3541801cc0 100644
--- a/module/task/lang/zh-cn.php
+++ b/module/task/lang/zh-cn.php
@@ -86,7 +86,8 @@ $lang->task->recordEstimate    = '工时';
 $lang->task->editEstimate      = '编辑工时';
 $lang->task->deleteEstimate    = '删除工时';
 
-$lang->task->ditto = '同上';
+$lang->task->ditto         = '同上';
+$lang->task->selectAllUser = '选择全部人员';
 
 $lang->task->statusList['']        = '';
 $lang->task->statusList['wait']    = '未开始';
diff --git a/module/task/view/create.html.php b/module/task/view/create.html.php
index 7605570d34..bcd16af699 100644
--- a/module/task/view/create.html.php
+++ b/module/task/view/create.html.php
@@ -31,14 +31,17 @@
         <th><?php echo $lang->task->module;?></th>
         <td id='moduleIdBox' class='w-p25-f'><?php echo html::select('module', $moduleOptionMenu, $task->module, "class='form-control chosen' onchange='setStories(this.value,$project->id)'");?></td><td></td><td class='w-150px'></td>
       </tr>
-      <tr>
-        <th><?php echo $lang->task->assignedTo;?></th>
-        <td><?php echo html::select('assignedTo[]', $members, $task->assignedTo, "class='form-control chosen'");?></td><td></td>
-      </tr>
       <tr>
         <th><?php echo $lang->task->type;?></th>
         <td><?php echo html::select('type', $lang->task->typeList, $task->type, 'class=form-control onchange="setOwners(this.value)"');?></td><td></td>
       </tr>
+      <tr>
+        <th><?php echo $lang->task->assignedTo;?></th>
+        <td><?php echo html::select('assignedTo[]', $members, $task->assignedTo, "class='form-control chosen'");?></td>
+        <td>
+          <button type='button' class='btn btn-link<?php echo $task->type == 'affair' ? '' : ' hidden'?>' id='selectAllUser'><?php echo $lang->task->selectAllUser ?></button>
+        </td>
+      </tr>
       <tr>
         <th><?php echo $lang->task->story;?></th>
         <td colspan='2'>