diff --git a/packages/article/src/Http/Controllers/ArticleCategoryController.php b/packages/article/src/Http/Controllers/ArticleCategoryController.php
index 6148a37..fa16a08 100644
--- a/packages/article/src/Http/Controllers/ArticleCategoryController.php
+++ b/packages/article/src/Http/Controllers/ArticleCategoryController.php
@@ -87,7 +87,10 @@ class ArticleCategoryController extends AdminController
             $form->text('remarks');
             $form->hidden('level')->default(1);
 
-            $form->keyValue('ext', '扩展字段')->default($this->extDefaults)->setKeyLabel('键名')->setValueLabel('键值');
+            $form->keyValue('ext', '扩展字段')->default($this->extDefaults)->setKeyLabel('键名')->setValueLabel('键值')
+                ->saving(function($v){
+                    return json_encode($v ?? []);
+                });
 
             $controller = $this;
             $form->saving(function (Form $form) use ($controller) {
diff --git a/packages/article/src/Http/Controllers/ArticleController.php b/packages/article/src/Http/Controllers/ArticleController.php
index 1a3bf04..2d6e7a1 100644
--- a/packages/article/src/Http/Controllers/ArticleController.php
+++ b/packages/article/src/Http/Controllers/ArticleController.php
@@ -107,7 +107,10 @@ class ArticleController extends AdminController
             $form->number('sort')->min(0)->default(0);
             $form->text('remarks');
 
-            $form->keyValue('ext', '扩展字段')->default($this->extDefaults)->setKeyLabel('键名')->setValueLabel('键值');
+            $form->keyValue('ext', '扩展字段')->default($this->extDefaults)->setKeyLabel('键名')->setValueLabel('键值')
+                ->saving(function($v){
+                    return json_encode($v ?? []);
+                });
 
             $form->editor('content')->options([
                     'plugins' => [