diff --git a/ui/src/workflow/nodes/base-node/component/FieldFormDialog.vue b/ui/src/workflow/nodes/base-node/component/FieldFormDialog.vue
index 021950cc7..1805eaea8 100644
--- a/ui/src/workflow/nodes/base-node/component/FieldFormDialog.vue
+++ b/ui/src/workflow/nodes/base-node/component/FieldFormDialog.vue
@@ -132,7 +132,7 @@ const form = ref<any>({
 
 const rules = reactive({
   name: [{ required: true, message: '请输入变量名', trigger: 'blur' }],
-  variable: [{ required: true, message: '请输入变量', trigger: 'blur' }],
+  variable: [{ required: true, message: '请输入变量', trigger: 'blur' }, { pattern: /^[a-zA-Z_]+$/, message: '只能输入字母和下划线', trigger: 'blur' } ],
   default_value: [{ required: true, message: '请输入默认值', trigger: 'blur' }]
 })