diff --git a/packages/fineui/src/base/tree/customtree.js b/packages/fineui/src/base/tree/customtree.js
index df3a87671..349ae0912 100644
--- a/packages/fineui/src/base/tree/customtree.js
+++ b/packages/fineui/src/base/tree/customtree.js
@@ -123,9 +123,8 @@ export class CustomTree extends Widget {
             itemsCreator: (op, callback) => {
                 itemsCreator.apply(this, [
                     op,
-                    items => {
-                        const args = Array.prototype.slice.call(arguments, 0);
-                        args[0] = this._formatItems(items);
+                    (...args) => {
+                        args[0] = this._formatItems(args[0]);
                         callback(...args);
                     }
                 ]);