diff --git a/modules/arena/api_rank.go b/modules/arena/api_rank.go
index ca0c13a56..3d4ba509e 100644
--- a/modules/arena/api_rank.go
+++ b/modules/arena/api_rank.go
@@ -53,16 +53,16 @@ func (this *apiComp) Rank(session comm.IUserSession, req *pb.ArenaRankReq) (errd
 	for _, v := range ranks {
 		ranksMap[v.Uid] = v
 	}
-	players = make([]*pb.ArenaPlayer, len(ranks))
+	players = make([]*pb.ArenaPlayer, 0, len(uids))
 	for i, v := range uids {
 		if player, ok := ranksMap[v]; ok {
 			rank := int32(i + 1)
-			players[i] = &pb.ArenaPlayer{
+			players = append(players, &pb.ArenaPlayer{
 				Uinfo:    player.Uinfo,
 				Dan:      player.Dan,
 				Rank:     rank,
 				Integral: player.Integral,
-			}
+			})
 			if session.GetUserId() == player.Uinfo.Uid && info.Rank != rank {
 				info.Rank = rank
 				if err = this.module.modelArena.updateArenaUserInfo(info); err != nil {