diff --git a/ui/src/views/function-lib/component/FieldFormDialog.vue b/ui/src/views/function-lib/component/FieldFormDialog.vue
index fcaedf02a..7267ef1e7 100644
--- a/ui/src/views/function-lib/component/FieldFormDialog.vue
+++ b/ui/src/views/function-lib/component/FieldFormDialog.vue
@@ -18,6 +18,7 @@
         <el-input
           v-model="form.name"
           placeholder="请输入变量名"
+          maxlength="64"
           show-word-limit
           @blur="form.name = form.name.trim()"
         />