diff --git a/server/routes/stats.js b/server/routes/stats.js
index e9e0b9f..e8e640c 100644
--- a/server/routes/stats.js
+++ b/server/routes/stats.js
@@ -101,9 +101,10 @@ router.get('/yearly-net-income', (req, res) => {
   let grandTotal = { total_income: 0, total_expense: 0 };
 
   combined.forEach(row => {
-    grandTotal.total_income += row.total_income;
-    grandTotal.total_expense += row.total_expense;
+    // grandTotal 只累加年度汇总数据（month='00'），避免重复计算月明细
     if (row.month === '00') {
+      grandTotal.total_income += row.total_income;
+      grandTotal.total_expense += row.total_expense;
       yearlyStats.push({
         year: row.year,
         total_income: row.total_income,