diff --git a/frontend/src/frameworks/components/charts/KPICard.tsx b/frontend/src/frameworks/components/charts/KPICard.tsx
index 08bdaab..109bf68 100644
--- a/frontend/src/frameworks/components/charts/KPICard.tsx
+++ b/frontend/src/frameworks/components/charts/KPICard.tsx
@@ -54,10 +54,8 @@ export const KPICard: React.FC<KPICardProps> = ({ chart, data }) => {
       .filter((v) => !isNaN(v));
     const val = aggregate(nums, valueBinding.aggregation ?? 'sum');
 
-    // Label: use first row's label value or column name
-    const lbl = labelBinding
-      ? String(data[0][labelBinding.columnName] ?? valueBinding.columnName)
-      : valueBinding.columnName;
+    // Label: use value column name as title (e.g. "投诉量")
+    const lbl = valueBinding.columnName;
 
     // Auto-detect YoY and MoM columns from data keys
     const keys = Object.keys(data[0] ?? {});