diff --git a/WebContent/Accounting/LoanSimulation/LoanBasicInfo.jsp b/WebContent/Accounting/LoanSimulation/LoanBasicInfo.jsp
index c14d1c969..e5ba455c1 100644
--- a/WebContent/Accounting/LoanSimulation/LoanBasicInfo.jsp
+++ b/WebContent/Accounting/LoanSimulation/LoanBasicInfo.jsp
@@ -835,6 +835,9 @@ function getRatioByMoney(e){
 	} 
 	var ratio = 100 - Number(firstPaymentRatio);
 	var firstPayment = equipAmt * Number(firstPaymentRatio) / 100;
+	if(Number(getItemValue(0, 0, "FIRST_PAYMENT")) != firstPayment) {
+		firstPayment = Number(getItemValue(0, 0, "FIRST_PAYMENT"));
+	}
 	cleanLeaseMoney = equipAmt - firstPayment + Number(allMoney);
 	setItemValue(0, 0, "RENT_RATIO", ((cleanLeaseMoney / equipAmt) * 100).toFixed(6) + "");
 	setItemValue(0, 0, "CLEAN_LEASE_MONEY", cleanLeaseMoney + "");