diff --git a/modules/hero/api_buy.go b/modules/hero/api_buy.go
index df951e7cc..dcd6e13e4 100644
--- a/modules/hero/api_buy.go
+++ b/modules/hero/api_buy.go
@@ -29,7 +29,7 @@ func (this *apiComp) Buy(session comm.IUserSession, req *pb.HeroBuyReq) (code pb
 		totalCount int32 // 当前购买的总次数
 		update     map[string]interface{}
 		price      []int32 // 购买所需的价钱
-		totalCost  float32 // 购买打折系数
+		totalCost  float64 // 购买打折系数
 		udata      *pb.DBUser
 	)
 	update = make(map[string]interface{})
@@ -75,16 +75,17 @@ func (this *apiComp) Buy(session comm.IUserSession, req *pb.HeroBuyReq) (code pb
 	for i := record.Onebuy; i < req.BuyCount; i++ {
 
 		if i >= int32(len(price)) {
-			totalCost += float32(price[len(price)-1]) / 1000
+			totalCost += float64(price[len(price)-1]) / 1000
+			continue
 		}
-		totalCost += float32(price[i]) / 1000
+		totalCost += float64(price[i]) / 1000
 	}
 	need = make([]*cfg.Gameatn, len(conf.Need))
 	for i, v := range conf.Need {
 		need[i] = &cfg.Gameatn{
 			A: v.A,
 			T: v.T,
-			N: int32(math.Ceil(float64(v.N) * float64(totalCost))),
+			N: int32(math.Ceil(float64(v.N) * totalCost)),
 		}
 	}
 	// 消耗