diff --git a/module/task/tao.php b/module/task/tao.php
index 33826918ba..2605993aa3 100644
--- a/module/task/tao.php
+++ b/module/task/tao.php
@@ -880,7 +880,7 @@ class taskTao extends taskModel
      *
      * @param  int       $parentID
      * @param  object    $data
-     * @param  string    $action
+     * @param  string    $action Activated
      * @param  string    $comment
      * @access protected
      * @return void
diff --git a/module/task/test/tao/updatechildrenbyparent.php b/module/task/test/tao/updatechildrenbyparent.php
new file mode 100755
index 0000000000..56ecabb299
--- /dev/null
+++ b/module/task/test/tao/updatechildrenbyparent.php
@@ -0,0 +1,36 @@
+#!/usr/bin/env php
+<?php
+include dirname(__FILE__, 5) . '/test/lib/init.php';
+include dirname(__FILE__, 2) . '/task.class.php';
+
+zdTable('action')->gen(0);
+zdTable('task')->config('task', true)->gen(10);
+
+/**
+
+title=taskModel->updateChildrenByParent();
+timeout=0
+cid=1
+
+*/
+
+$parentIdList = array(1, 6, 7);
+$actionList   = array('Started', 'Activated', 'Closed');
+$commentList  = array('', '这是一条备注');
+
+$taskTester = new taskTest();
+
+r($taskTester->updateChildrenByParentTest($parentIdList[0], $actionList[0], $commentList[0])) && p() && e('0'); // 测试开始普通任务
+r($taskTester->updateChildrenByParentTest($parentIdList[0], $actionList[1], $commentList[0])) && p() && e('0'); // 测试激活普通任务
+r($taskTester->updateChildrenByParentTest($parentIdList[0], $actionList[2], $commentList[0])) && p() && e('0'); // 测试关闭普通任务
+r($taskTester->updateChildrenByParentTest($parentIdList[0], $actionList[0], $commentList[1])) && p() && e('0'); // 测试开始普通任务并留备注
+
+r($taskTester->updateChildrenByParentTest($parentIdList[1], $actionList[0], $commentList[0])) && p('action') && e('started');   // 测试开始父任务
+r($taskTester->updateChildrenByParentTest($parentIdList[1], $actionList[1], $commentList[0])) && p('action') && e('activated'); // 测试激活父任务
+r($taskTester->updateChildrenByParentTest($parentIdList[1], $actionList[2], $commentList[0])) && p('action') && e('closed');    // 测试关闭父任务
+r($taskTester->updateChildrenByParentTest($parentIdList[1], $actionList[0], $commentList[1])) && p('action') && e('started');   // 测试开始父任务并留备注
+
+r($taskTester->updateChildrenByParentTest($parentIdList[2], $actionList[0], $commentList[0])) && p() && e('0'); // 测试开始子任务
+r($taskTester->updateChildrenByParentTest($parentIdList[2], $actionList[1], $commentList[0])) && p() && e('0'); // 测试激活子任务
+r($taskTester->updateChildrenByParentTest($parentIdList[2], $actionList[2], $commentList[0])) && p() && e('0'); // 测试关闭子任务
+r($taskTester->updateChildrenByParentTest($parentIdList[2], $actionList[0], $commentList[1])) && p() && e('0'); // 测试开始子任务并留备注
diff --git a/module/task/test/task.class.php b/module/task/test/task.class.php
index 07d7d2d075..2d41fcddf2 100755
--- a/module/task/test/task.class.php
+++ b/module/task/test/task.class.php
@@ -2208,4 +2208,29 @@ class taskTest
 
         return $this->objectModel->dao->select('action')->from(TABLE_ACTION)->where('objectType')->eq('task')->andWhere('objectID')->eq($oldParentTask->id)->orderBy('`id` desc')->fetch();;
     }
+
+    /**
+     * 通过父任务更新子任务。
+     * Update chilren task by parent task.
+     *
+     * @param  int    $parentID
+     * @param  string $action
+     * @param  string $comment
+     * @access public
+     * @return object|false
+     */
+    public function updateChildrenByParentTest(int $parentID, string $action, string $comment): object|false
+    {
+        $task = $this->objectModel->getByID($parentID);
+
+        $data = new stdclass();
+        $data->name   = $task->name;
+        $data->pri    = $task->pri;
+        $data->status = $task->status;
+
+        $this->objectModel->updateChildrenByParent($parentID, $data, $action, $comment);
+
+        $childID = $this->objectModel->dao->select('id')->from(TABLE_TASK)->where('parent')->eq($parentID)->fetch('id');
+        return $this->objectModel->dao->select('action')->from(TABLE_ACTION)->where('objectType')->eq('task')->andWhere('objectID')->eq($childID)->orderBy('id_desc')->fetch();
+    }
 }