diff --git a/module/my/ui/task.html.php b/module/my/ui/task.html.php
index 527a97f4f1..f05c32a344 100644
--- a/module/my/ui/task.html.php
+++ b/module/my/ui/task.html.php
@@ -42,6 +42,16 @@ $data  = array_values($tasks);
 
 if($config->edition == 'ipd')
 {
+    static $canStartExecution = '';
+    static $executionID       = '';
+    foreach($data as $task)
+    {
+        if(empty($canStartExecution) || $executionID != $task->execution)
+        {
+            $executionID       = $task->execution;
+            $canStartExecution = $this->execution->checkStageStatus($executionID, 'start');
+        }
+
         if(!empty($canStartExecution['disabled']))
         {
             foreach($task->actions as $key => $action)
@@ -54,6 +64,7 @@ if($config->edition == 'ipd')
                 }
             }
         }
+    }
 }
 
 dtable
diff --git a/module/task/model.php b/module/task/model.php
index c600a24167..665be5a0c5 100755
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -2191,6 +2191,10 @@ class taskModel extends model
 
         $executionInfo = zget($task, 'executionInfo', array());
 
+        /* 如果是IPD串行项目下的任务，则只有当前阶段开始以后才能开始/关闭任务。*/
+        /* If it is a task under an IPD serial project, the task can be started / closed only after the current phase begins. */
+        if(!empty($executionInfo->canStartExecution['disabled']) && in_array($action, array('start', 'finish', 'recordworkhour'))) return false;
+
         /* 根据状态判断是否可以点击。 Check clickable by status. */
         if($action == 'batchcreate')        return (empty($task->team) || empty($task->children)) && zget($executionInfo, 'type') != 'kanban';
         if($action == 'start')              return $task->status == 'wait';
diff --git a/module/task/ui/view.html.php b/module/task/ui/view.html.php
index bfc58d7770..7b030efbf6 100644
--- a/module/task/ui/view.html.php
+++ b/module/task/ui/view.html.php
@@ -34,6 +34,7 @@ $config->task->actionList['batchCreate']['hint'] = $config->task->actionList['ba
 /* Build confirmeObject. */
 if($this->config->edition == 'ipd')
 {
+    $execution->canStartExecution = $this->loadModel('execution')->checkStageStatus($execution->id, 'start');
     $task = $this->loadModel('story')->getAffectObject(array(), 'task', $task);
 
     if(!empty($task->confirmeActionType)) $config->task->actions->view['mainActions']   = array('confirmDemandRetract', 'confirmDemandUnlin');