diff --git a/frontend/pages/stats.js b/frontend/pages/stats.js
index 332d1da..d7c1c67 100644
--- a/frontend/pages/stats.js
+++ b/frontend/pages/stats.js
@@ -141,9 +141,15 @@ export default function Stats() {
     setCurrentMonth(newDate);
   };
 
+  // 当分类数据加载后，默认选中所有分类
+  useEffect(() => {
+    if (categoryData.length > 0) {
+      setSelectedCategories(categoryData.map(cat => cat.category));
+    }
+  }, [categoryData]);
+
   const handleCategoryTypeChange = (type) => {
     setCategoryType(type);
-    setSelectedCategories([]); // 切换类型时清空选中
   };
 
   const toggleCategory = (categoryName) => {