diff --git a/ruoyi-system/src/main/java/com/ruoyi/system/service/impl/SysDeptServiceImpl.java b/ruoyi-system/src/main/java/com/ruoyi/system/service/impl/SysDeptServiceImpl.java
index 35f6276..aa69c47 100644
--- a/ruoyi-system/src/main/java/com/ruoyi/system/service/impl/SysDeptServiceImpl.java
+++ b/ruoyi-system/src/main/java/com/ruoyi/system/service/impl/SysDeptServiceImpl.java
@@ -241,7 +241,7 @@ public class SysDeptServiceImpl implements ISysDeptService
         List<SysDept> children = deptMapper.selectChildrenDeptById(deptId);
         for (SysDept child : children)
         {
-            child.setAncestors(child.getAncestors().replace(oldAncestors, newAncestors));
+            child.setAncestors(child.getAncestors().replaceFirst(oldAncestors, newAncestors));
         }
         if (children.size() > 0)
         {