diff --git a/src/main/java/com/budwk/app/zhgh/democratic/teachercongress/delegation/controller/TeacherCongressDelegationController.java b/src/main/java/com/budwk/app/zhgh/democratic/teachercongress/delegation/controller/TeacherCongressDelegationController.java
index f54c8b7e..13677eb4 100644
--- a/src/main/java/com/budwk/app/zhgh/democratic/teachercongress/delegation/controller/TeacherCongressDelegationController.java
+++ b/src/main/java/com/budwk/app/zhgh/democratic/teachercongress/delegation/controller/TeacherCongressDelegationController.java
@@ -85,9 +85,9 @@ public class TeacherCongressDelegationController {
                 SELECT
                    	tcd.*,
                    	tcs.fullName as sessionName,
-                   	GROUP_CONCAT(u.username,u.loginname) as delegationHead,
-                   	GROUP_CONCAT(u2.username,u2.loginname) as viceDelegationHead,
-                   	GROUP_CONCAT(u3.username,u3.loginname) as delegationContact
+                   	GROUP_CONCAT(DISTINCT u.username,u.loginname) as delegationHead,
+                   	GROUP_CONCAT(DISTINCT u2.username,u2.loginname) as viceDelegationHead,
+                   	GROUP_CONCAT(DISTINCT u3.username,u3.loginname) as delegationContact
                 FROM
                    	teacher_congress_delegation tcd
                    	LEFT JOIN teacher_congress_session tcs ON tcs.id = tcd.sessionId