diff --git a/backend/src/main/java/io/dataease/service/dataset/DataSetTableUnionService.java b/backend/src/main/java/io/dataease/service/dataset/DataSetTableUnionService.java
index 3c8ec99224..12a8004b7a 100644
--- a/backend/src/main/java/io/dataease/service/dataset/DataSetTableUnionService.java
+++ b/backend/src/main/java/io/dataease/service/dataset/DataSetTableUnionService.java
@@ -88,6 +88,7 @@ public class DataSetTableUnionService {
         criteria.andTargetTableFieldIdEqualTo(datasetTableUnion.getTargetTableFieldId());
         List<DatasetTableUnion> sourceResult = datasetTableUnionMapper.selectByExample(datasetTableUnionExample);
         datasetTableUnionExample.clear();
+        criteria = datasetTableUnionExample.createCriteria();
         if (StringUtils.isNotEmpty(datasetTableUnion.getId())) {
             criteria.andIdNotEqualTo(datasetTableUnion.getId());
         }
diff --git a/frontend/src/views/dataset/data/UnionView.vue b/frontend/src/views/dataset/data/UnionView.vue
index 19edacf70c..e975d11c51 100644
--- a/frontend/src/views/dataset/data/UnionView.vue
+++ b/frontend/src/views/dataset/data/UnionView.vue
@@ -230,6 +230,7 @@ export default {
         targetTableFieldId: '',
         targetUnionRelation: ''
       }
+      this.targetTable = {}
     },
 
     edit(item) {