diff --git a/et_calc/dataCalc.go b/et_calc/dataCalc.go
index 82e16d7..6aafeca 100644
--- a/et_calc/dataCalc.go
+++ b/et_calc/dataCalc.go
@@ -193,7 +193,7 @@ func (the *CalcHandler) calcExpressionResult(formulaExpression string, paramMap
 
 	for _, pk := range paramsK {
 		pv := paramMap[pk]
-		formulaExpression = strings.Replace(formulaExpression, pk, fmt.Sprintf("%v", pv), -1)
+		formulaExpression = strings.Replace(formulaExpression, pk, fmt.Sprintf("%f", pv), -1)
 	}
 	fsp := strings.Split(formulaExpression, "=")
 	templateStr := fsp[1]