diff --git a/pc4mobx/hrmSalary/util/index.js b/pc4mobx/hrmSalary/util/index.js
index 65a739ff..e5b3c1aa 100644
--- a/pc4mobx/hrmSalary/util/index.js
+++ b/pc4mobx/hrmSalary/util/index.js
@@ -117,17 +117,10 @@ export const padding0 = (num, length) => {
   }
   return "0." + num;
 };
-export const toDecimal_n = (x, num) => {
-  if (isNaN(parseFloat(x))) return false;
-  let f = Math.round(x * Math.pow(10, num)) / Math.pow(10, num);
-  let s = f.toString();
-  let rs = s.indexOf(".");
-  if (rs < 0) {
-    rs = s.length;
-    s += ".";
-  }
-  while (s.length <= rs + num) {
-    s += "0";
-  }
-  return s;
+export const toDecimal_n = (num, decimalPlaces) => {
+  if (num === null || !isFinite(num)) return null
+  if (decimalPlaces < 0) return null;
+  const multiplier = Math.pow(10, decimalPlaces);
+  const roundedNum = Math.round(num * multiplier) / multiplier;
+  return roundedNum.toFixed(decimalPlaces);
 };