diff --git a/packages/designer/src/document/node/node-children.ts b/packages/designer/src/document/node/node-children.ts
index 68026e831..1553a54f3 100644
--- a/packages/designer/src/document/node/node-children.ts
+++ b/packages/designer/src/document/node/node-children.ts
@@ -285,4 +285,9 @@ export class NodeChildren {
     this.purged = true;
     this.children.forEach(child => child.purge());
   }
+
+  get [Symbol.toStringTag]() {
+    // 保证向前兼容性
+    return "Array";
+  }
 }