diff --git a/laws-modules/src/main/java/com/jero/modules/activiti/mapper/xml/ProcessNodeMapper.xml b/laws-modules/src/main/java/com/jero/modules/activiti/mapper/xml/ProcessNodeMapper.xml
index 748a1c83..82f412df 100644
--- a/laws-modules/src/main/java/com/jero/modules/activiti/mapper/xml/ProcessNodeMapper.xml
+++ b/laws-modules/src/main/java/com/jero/modules/activiti/mapper/xml/ProcessNodeMapper.xml
@@ -5,7 +5,7 @@
     <select id="selectByIdPdIdAndPiId" resultType="com.jero.modules.activiti.entity.ProcessNode">
         select pn.*
         <if test="processInstanceId != null and processInstanceId != ''">
-            ,group_concat(pnl.user_id) as link_user_ids
+            ,group_concat(DISTINCT pnl.user_id) as link_user_ids
         </if>
         from process_node pn
         <if test="processInstanceId != null and processInstanceId != ''">