diff --git a/modules/arena/api_buy.go b/modules/arena/api_buy.go
index 3fbc94846..7e6b29034 100644
--- a/modules/arena/api_buy.go
+++ b/modules/arena/api_buy.go
@@ -20,7 +20,6 @@ func (this *apiComp) Buy(session comm.IUserSession, req *pb.ArenaBuyReq) (code p
 	var (
 		// global    *cfg.GameGlobalData
 		info           *pb.DBArenaUser
-		challenge      *cfg.GameArenaBuyChallengeData
 		need           []*cfg.Gameatn
 		maxbuy, vipbuy int
 		err            error
@@ -46,7 +45,7 @@ func (this *apiComp) Buy(session comm.IUserSession, req *pb.ArenaBuyReq) (code p
 			return
 		}
 		if res := this.module.ModuleTools.GetPriceGroupCost(comm.ArenaBuyType, info.Buynum+i+1); len(res) > 0 {
-			need = append(need, challenge.Need...)
+			need = append(need, res...)
 		} else {
 			code = pb.ErrorCode_ConfigNoFound
 			return