diff --git a/commission.go b/commission.go
index 4681e79..0a5a180 100644
--- a/commission.go
+++ b/commission.go
@@ -6,8 +6,9 @@ package ordercalc
 
 import (
 	"errors"
-
 	"strings"
+
+	"git.tetele.net/tgo/helper"
 )
 
 /**
@@ -22,7 +23,7 @@ import (
  */
 func DistributionPrice(business map[string]string, productSpecialPrice []map[string]string, distributionPrice interface{}, percentAge interface{}, productPrice interface{}) (float64, error) {
 
-	product_price := ToString(productPrice)
+	product_price := helper.ToString(productPrice)
 
 	if len(business) < 1 {
 		return 0, errors.New("参数错误")
@@ -34,13 +35,13 @@ func DistributionPrice(business map[string]string, productSpecialPrice []map[str
 		return 0, errors.New("分销商参数错误")
 	}
 
-	distribution_price := ToString(distributionPrice)
+	distribution_price := helper.ToString(distributionPrice)
 	distribution_price_float, err := ToFloat64(distributionPrice)
 	if err != nil {
 		return 0, err
 	}
 
-	percent_age := ToString(percentAge)
+	percent_age := helper.ToString(percentAge)
 
 	if len(productSpecialPrice) < 1 && percent_age == "" {
 		return distribution_price_float, nil //没有特殊价格，没有分销比例，返回原分销价
@@ -179,7 +180,7 @@ func DistributionPrice(business map[string]string, productSpecialPrice []map[str
  */
 func VipPrice(productSpecialPrice []map[string]string, productPrice interface{}) (float64, error) {
 
-	product_price := ToString(productPrice)
+	product_price := helper.ToString(productPrice)
 
 	product_price_float, _ := ToFloat64(productPrice)
 
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..08eb75c
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.tetele.net/tgo/ordercalc
+
+go 1.14