diff --git a/ccdi-info-collection/src/test/java/com/ruoyi/info/collection/service/CcdiStaffFmyRelationServiceImplTest.java b/ccdi-info-collection/src/test/java/com/ruoyi/info/collection/service/CcdiStaffFmyRelationServiceImplTest.java
index b1e689d..f470fb3 100644
--- a/ccdi-info-collection/src/test/java/com/ruoyi/info/collection/service/CcdiStaffFmyRelationServiceImplTest.java
+++ b/ccdi-info-collection/src/test/java/com/ruoyi/info/collection/service/CcdiStaffFmyRelationServiceImplTest.java
@@ -116,6 +116,30 @@ class CcdiStaffFmyRelationServiceImplTest {
         verify(assetInfoService, never()).replaceByFamilyIdAndPersonId(any(), any(), any());
     }
 
+    @Test
+    void updateRelation_shouldRejectRelationCertNoChange() {
+        CcdiStaffFmyRelation existing = new CcdiStaffFmyRelation();
+        existing.setId(10L);
+        existing.setRelationCertType("护照");
+        existing.setRelationCertNo("A123456789");
+
+        CcdiStaffFmyRelationEditDTO editDTO = new CcdiStaffFmyRelationEditDTO();
+        editDTO.setId(10L);
+        editDTO.setPersonId("320101199001010011");
+        editDTO.setRelationType("配偶");
+        editDTO.setRelationName("李四");
+        editDTO.setRelationCertType("护照");
+        editDTO.setRelationCertNo("B987654321");
+
+        when(relationMapper.selectById(10L)).thenReturn(existing);
+
+        RuntimeException exception = assertThrows(RuntimeException.class, () -> service.updateRelation(editDTO));
+
+        assertEquals("关系人证件类型/证件号码不允许修改", exception.getMessage());
+        verify(relationMapper, never()).updateById(any(CcdiStaffFmyRelation.class));
+        verify(assetInfoService, never()).replaceByFamilyIdAndPersonId(any(), any(), any());
+    }
+
     @Test
     void updateRelation_shouldReplaceAssetsByOwnershipKey() {
         CcdiStaffFmyRelation existing = new CcdiStaffFmyRelation();