diff --git a/xhpc-modules/xhpc-activity/src/main/resources/mapper/XhpcWorkDeptMapper.xml b/xhpc-modules/xhpc-activity/src/main/resources/mapper/XhpcWorkDeptMapper.xml
index 5a7a86d3..1214e741 100644
--- a/xhpc-modules/xhpc-activity/src/main/resources/mapper/XhpcWorkDeptMapper.xml
+++ b/xhpc-modules/xhpc-activity/src/main/resources/mapper/XhpcWorkDeptMapper.xml
@@ -41,9 +41,14 @@
     <if test="params.tenantId !=null and params.tenantId!=''">
       and tenant_id=#{params.tenantId}
     </if>
-    <if test="params.parentDeptId !=null and params.parentDeptId!=''">
-      and parent_dept_id=#{params.parentDeptId}
-    </if>
+      <choose>
+        <when test="params.parentDeptId !=null and params.parentDeptId!=''">
+          and parent_dept_id=#{params.parentDeptId}
+        </when>
+      <otherwise>
+        and parent_dept_id is null
+      </otherwise>
+      </choose>
   </select>