diff --git a/frontend/src/views/dataset/common/DatasetGroupSelector.vue b/frontend/src/views/dataset/common/DatasetGroupSelector.vue
index 48225d21ef..fc5a2ce319 100644
--- a/frontend/src/views/dataset/common/DatasetGroupSelector.vue
+++ b/frontend/src/views/dataset/common/DatasetGroupSelector.vue
@@ -24,7 +24,7 @@
       <!--      </el-row>-->
 
       <el-col class="custom-tree-container">
-        <div class="block">
+        <div class="block" :style="treeStyle">
           <el-tree
             :default-expanded-keys="expandedArray"
             :data="data"
@@ -110,6 +110,11 @@ import { isKettleRunning, post } from '@/api/dataset/dataset'
 export default {
   name: 'DatasetGroupSelector',
   props: {
+    fixHeight: {
+      type: Boolean,
+      required: false,
+      default: false
+    },
     customType: {
       type: Array,
       required: false,
@@ -163,7 +168,11 @@ export default {
         name: '',
         sort: 'type asc,create_time desc,name asc'
       },
-      dsLoading: false
+      dsLoading: false,
+      treeStyle: this.fixHeight ? {
+        height: '200px',
+        overflow: 'auto'
+      } : {}
     }
   },
   computed: {},
diff --git a/frontend/src/views/dataset/data/UnionView.vue b/frontend/src/views/dataset/data/UnionView.vue
index b5d4e2940c..27d0d0d31e 100644
--- a/frontend/src/views/dataset/data/UnionView.vue
+++ b/frontend/src/views/dataset/data/UnionView.vue
@@ -92,7 +92,7 @@
             width="500"
             trigger="click"
           >
-            <dataset-group-selector show-mode="union" :custom-type="customType" :mode="1" @getTable="getTable" />
+            <dataset-group-selector :fix-height="true" show-mode="union" :custom-type="customType" :mode="1" @getTable="getTable" />
             <el-button slot="reference" size="mini" style="width: 100%;">
               <p class="table-name-css" :title="targetTable.name || $t('dataset.pls_slc_union_table')">{{ targetTable.name || $t('dataset.pls_slc_union_table') }}</p>
             </el-button>