diff --git a/bms-back/bms-system/src/main/java/com/bms/ar/service/impl/ArBillServiceImpl.java b/bms-back/bms-system/src/main/java/com/bms/ar/service/impl/ArBillServiceImpl.java
index 8b095eef..6753d359 100644
--- a/bms-back/bms-system/src/main/java/com/bms/ar/service/impl/ArBillServiceImpl.java
+++ b/bms-back/bms-system/src/main/java/com/bms/ar/service/impl/ArBillServiceImpl.java
@@ -1570,8 +1570,7 @@ public class ArBillServiceImpl implements IArBillService {
     private void writeOoxmlFooter(OutputStream output, Map<Integer, String> templateRows, int footerRow, ArBill bill)
             throws IOException {
         int rowOffset = footerRow - TEMPLATE_FOOTER_START_ROW;
-        int lastDetailRow = Math.max(TEMPLATE_DATA_START_ROW, footerRow - 1);
-        String totalAmountFormula = "SUM(S" + TEMPLATE_DATA_START_ROW + ":S" + lastDetailRow + ")";
+        String totalAmountFormula = "SUM(S" + TEMPLATE_DATA_START_ROW + ":INDEX(S:S,ROW()-1))";
         for (int offset = 0; offset < 4; offset++) {
             int sourceRowNumber = TEMPLATE_FOOTER_START_ROW + offset + 1;
             int targetRowNumber = sourceRowNumber + rowOffset;