diff --git a/server/gameserver/gamelog.cc b/server/gameserver/gamelog.cc
index 5c17086..28b9621 100644
--- a/server/gameserver/gamelog.cc
+++ b/server/gameserver/gamelog.cc
@@ -32,8 +32,8 @@ void GameLog::GameStart(Player* hum)
     prop->SetVal("server_node_id", App::Instance()->node_id);
     prop->SetVal("server_instance_id", App::Instance()->instance_id);
 
-    prop->SetVal("map_id", hum->room->map_meta->i->map_id());
-    prop->SetVal("map_name", hum->room->map_meta->i->map_name());
+    prop->SetVal("map_id", hum->room->map_meta->p->map_id());
+    prop->SetVal("map_name", hum->room->map_meta->p->map_name());
     prop->SetVal("map_tpl_name", hum->room->map_tpl_name);
 
     f8::TGLog::Instance()->AddTrackLog(game_id, hum->account_id, hum->ip_saddr, logclass1, logclass2, prop);
@@ -72,8 +72,8 @@ void GameLog::GameEnd(Player* hum)
     prop->SetVal("server_node_id", App::Instance()->node_id);
     prop->SetVal("server_instance_id", App::Instance()->instance_id);
 
-    prop->SetVal("map_id", hum->room->map_meta->i->map_id());
-    prop->SetVal("map_name", hum->room->map_meta->i->map_name());
+    prop->SetVal("map_id", hum->room->map_meta->p->map_id());
+    prop->SetVal("map_name", hum->room->map_meta->p->map_name());
     prop->SetVal("map_tpl_name", hum->room->map_tpl_name);
     if (!hum->dead) {
         prop->SetVal("alive_time", hum->room->frame_no * 1000.0f / SERVER_FRAME_RATE);
diff --git a/server/gameserver/human.cc b/server/gameserver/human.cc
index dc6a334..2f39e20 100644
--- a/server/gameserver/human.cc
+++ b/server/gameserver/human.cc
@@ -43,16 +43,7 @@ float Human::GetSpeed()
     #if 1
     return 0;
     #else
-    return meta->i->move_speed() + buff.speed;
-    #endif
-}
-
-float Human::GetSpeed4()
-{
-    #if 1
-    return 0;
-    #else
-    return meta->i->move_speed4();
+    return meta->p->move_speed() + buff.speed;
     #endif
 }
 
@@ -61,10 +52,6 @@ void Human::FillMFObjectPart(cs::MFObjectPart* part_data)
     part_data->set_object_type(ET_Player);
     cs::MFPlayerPart* p = part_data->mutable_union_obj_1();
     p->set_obj_uniid(entity_uniid);
-    #if 0
-    TypeConvert::ToPb(pos, p->mutable_pos());
-    TypeConvert::ToPb(attack_dir, p->mutable_dir());
-    #endif
 }
 
 void Human::FillMFObjectFull(cs::MFObjectFull* full_data)
@@ -72,10 +59,6 @@ void Human::FillMFObjectFull(cs::MFObjectFull* full_data)
     full_data->set_object_type(ET_Player);
     cs::MFPlayerFull* p = full_data->mutable_union_obj_1();
     p->set_obj_uniid(entity_uniid);
-    #if 0
-    TypeConvert::ToPb(pos, p->mutable_pos());
-    TypeConvert::ToPb(attack_dir, p->mutable_dir());
-    #endif
 
     p->set_dead(dead);
     p->set_disconnected(disconnected);
@@ -148,10 +131,10 @@ void Human::GetAabbBox(AabbCollider& aabb_box)
     #if 0
     aabb_box.active = true;
     aabb_box.owner = this;
-    aabb_box._min.x = -meta->i->radius();
-    aabb_box._min.y = -meta->i->radius();
-    aabb_box._max.x = meta->i->radius();
-    aabb_box._max.y = meta->i->radius();
+    aabb_box._min.x = -meta->p->radius();
+    aabb_box._min.y = -meta->p->radius();
+    aabb_box._max.x = meta->p->radius();
+    aabb_box._max.y = meta->p->radius();
     #endif
 }
 
@@ -182,14 +165,14 @@ void Human::RecalcSelfCollider()
         AddCollider(self_collider_);
     }
     self_collider_->pos = a8::Vec2();
-    self_collider_->rad = meta->i->radius();
+    self_collider_->rad = meta->p->radius();
     #endif
 }
 
 bool Human::IsCollisionInMapService()
 {
     #if 0
-    if (room->OverBorder(pos, meta->i->radius())){
+    if (room->OverBorder(pos, meta->p->radius())){
         return true;
     }
 
@@ -215,7 +198,7 @@ float Human::GetRadius()
     #if 1
     return 0;
     #else
-    return meta->i->radius();
+    return meta->p->radius();
     #endif
 }
 
@@ -691,8 +674,8 @@ void Human::GenBattleReportData(a8::MutableXObject* params)
     }
     stats.rank = rank;
     params->SetVal("account_id", account_id);
-    params->SetVal("map_id", room->map_meta->i->map_id());
-    params->SetVal("map_name", room->map_meta->i->map_name());
+    params->SetVal("map_id", room->map_meta->p->map_id());
+    params->SetVal("map_name", room->map_meta->p->map_name());
     params->SetVal("map_tpl_name", room->map_tpl_name);
     params->SetVal("game_time", time(nullptr));
     params->SetVal("hurt", stats.damage_amount_in);
diff --git a/server/gameserver/human.h b/server/gameserver/human.h
index 2c07c56..0e4020a 100644
--- a/server/gameserver/human.h
+++ b/server/gameserver/human.h
@@ -6,9 +6,7 @@
 
 namespace MetaData
 {
-    struct Player;
-    struct Equip;
-    struct Dress;
+
 }
 
 enum HumanStatus
@@ -63,7 +61,6 @@ class Human : public Entity
     virtual ~Human() override;
     virtual void Initialize() override;
     virtual float GetSpeed() override;
-    virtual float GetSpeed4();
     virtual void FillMFObjectPart(cs::MFObjectPart* part_data) override;
     virtual void FillMFObjectFull(cs::MFObjectFull* full_data) override;
     virtual void FillMFPlayerStats(cs::MFPlayerStats* stats);
@@ -118,6 +115,9 @@ private:
     void Revive();
 
 protected:
+    SnakeBodyNode* head_ = nullptr;
+    SnakeBodyNode* tail_ = nullptr;
+    std::list<SnakeBodyNode> body_list;
     long long last_sync_teamdata_frameno_ = 0;
     bool leave_ = false;
     long long leave_frameno_ = 0;
diff --git a/server/gameserver/metadata.cc b/server/gameserver/metadata.cc
index 0f57ffd..ff326d5 100644
--- a/server/gameserver/metadata.cc
+++ b/server/gameserver/metadata.cc
@@ -6,9 +6,9 @@ namespace MetaData
 {
     void Parameter::Init()
     {
-        int_val = a8::XValue(i->param_value());
-        float_val = a8::XValue(i->param_value());
-        str_val = a8::XValue(i->param_value()).GetString();
+        int_val = a8::XValue(p->param_value());
+        float_val = a8::XValue(p->param_value());
+        str_val = a8::XValue(p->param_value()).GetString();
     }
 
     void Map::Init()
diff --git a/server/gameserver/metadata.h b/server/gameserver/metadata.h
index 692faf4..f3e7090 100755
--- a/server/gameserver/metadata.h
+++ b/server/gameserver/metadata.h
@@ -7,7 +7,7 @@ namespace MetaData
 
     struct Parameter
     {
-        const metatable::Parameter* i = nullptr;
+        const metatable::Parameter* p = nullptr;
 
         int int_val = 0;
         std::string str_val;
@@ -18,36 +18,36 @@ namespace MetaData
 
     struct Map
     {
-        const metatable::Map* i = nullptr;
+        const metatable::Map* p = nullptr;
 
         void Init();
     };
 
     struct Robot
     {
-        const metatable::Robot* i = nullptr;
+        const metatable::Robot* p = nullptr;
 
         void Init();
     };
 
     struct RankReward
     {
-        const metatable::RankReward* i = nullptr;
+        const metatable::RankReward* p = nullptr;
     };
 
     struct KillReward
     {
-        const metatable::KillReward* i = nullptr;
+        const metatable::KillReward* p = nullptr;
     };
 
     struct RankPoint
     {
-        const metatable::RankPoint* i = nullptr;
+        const metatable::RankPoint* p = nullptr;
     };
 
     struct KillPoint
     {
-        const metatable::KillPoint* i = nullptr;
+        const metatable::KillPoint* p = nullptr;
     };
 
 }
diff --git a/server/gameserver/metamgr.cc b/server/gameserver/metamgr.cc
index f7d1e83..b8ac748 100755
--- a/server/gameserver/metamgr.cc
+++ b/server/gameserver/metamgr.cc
@@ -86,47 +86,47 @@ private:
 
         for (auto& meta : parameter_meta_list) {
             MetaData::Parameter& item = a8::FastAppend(parameter_list);
-            item.i = &meta;
+            item.p = &meta;
             item.Init();
-            parameter_hash[item.i->param_name()] = &item;
+            parameter_hash[item.p->param_name()] = &item;
         }
 
         {
             for (auto& meta : map_meta_list) {
                 MetaData::Map& item = a8::FastAppend(map_list);
-                item.i = &meta;
+                item.p = &meta;
                 item.Init();
-                gamemap_hash[item.i->map_id()] = &item;
+                gamemap_hash[item.p->map_id()] = &item;
             }
         }
 
        for (auto& meta : rankreward_meta_list) {
             MetaData::RankReward& item = a8::FastAppend(rankreward_list);
-            item.i = &meta;
-            rankreward_hash[item.i->rank()] = &item;
+            item.p = &meta;
+            rankreward_hash[item.p->rank()] = &item;
         }
 
        for (auto& meta : killreward_meta_list) {
            MetaData::KillReward& item = a8::FastAppend(killreward_list);
-           item.i = &meta;
-           killreward_hash[item.i->kill_num()] = &item;
+           item.p = &meta;
+           killreward_hash[item.p->kill_num()] = &item;
        }
 
        for (auto& meta : killpoint_meta_list) {
            MetaData::KillPoint& item = a8::FastAppend(killpoint_list);
-           item.i = &meta;
-           killpoint_hash[item.i->kill_num()] = &item;
+           item.p = &meta;
+           killpoint_hash[item.p->kill_num()] = &item;
        }
 
        for (auto& meta : rankpoint_meta_list) {
            MetaData::RankPoint& item = a8::FastAppend(rankpoint_list);
-           item.i = &meta;
-           rankpoint_hash[item.i->rank()] = &item;
+           item.p = &meta;
+           rankpoint_hash[item.p->rank()] = &item;
        }
 
        for (auto& meta : robot_meta_list) {
            MetaData::Robot& item = a8::FastAppend(robot_list);
-           item.i = &meta;
+           item.p = &meta;
            item.Init();
            robot_hash[meta.id()] = &item;
        }
@@ -185,37 +185,37 @@ MetaData::Map* MetaMgr::GetMap(int map_id)
 float MetaMgr::GetRankRewardParam(int rank)
 {
     auto itr = loader_->rankreward_hash.find(rank);
-    return itr != loader_->rankreward_hash.end() ? itr->second->i->parameter() : 0.0f;
+    return itr != loader_->rankreward_hash.end() ? itr->second->p->parameter() : 0.0f;
 }
 
 float MetaMgr::GetKillRewardParam(int kill_num)
 {
     auto itr = loader_->killreward_hash.find(kill_num);
-    return itr != loader_->killreward_hash.end() ? itr->second->i->parameter() : 0.0f;
+    return itr != loader_->killreward_hash.end() ? itr->second->p->parameter() : 0.0f;
 }
 
 int MetaMgr::GetRankPointParam1(int rank)
 {
     auto itr = loader_->rankpoint_hash.find(rank);
-    return itr != loader_->rankpoint_hash.end() ? itr->second->i->parameter() : 0;
+    return itr != loader_->rankpoint_hash.end() ? itr->second->p->parameter() : 0;
 }
 
 int MetaMgr::GetRankPointParam2(int rank)
 {
     auto itr = loader_->rankpoint_hash.find(rank);
-    return itr != loader_->rankpoint_hash.end() ? itr->second->i->parameter2() : 0;
+    return itr != loader_->rankpoint_hash.end() ? itr->second->p->parameter2() : 0;
 }
 
 int MetaMgr::GetKillPointParam1(int kill_num)
 {
     auto itr = loader_->killpoint_hash.find(kill_num);
-    return itr != loader_->killpoint_hash.end() ? itr->second->i->parameter() : 0;
+    return itr != loader_->killpoint_hash.end() ? itr->second->p->parameter() : 0;
 }
 
 int MetaMgr::GetKillPointParam2(int kill_num)
 {
     auto itr = loader_->killpoint_hash.find(kill_num);
-    return itr != loader_->killpoint_hash.end() ? itr->second->i->parameter2() : 0;
+    return itr != loader_->killpoint_hash.end() ? itr->second->p->parameter2() : 0;
 }
 
 std::vector<MetaData::Robot>* MetaMgr::GetRobotList()
diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index 2886aa1..88e8e8e 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -37,20 +37,20 @@ Room::~Room()
 
 void Room::Init()
 {
-    if (map_meta->i->map_width() < 1) {
+    if (map_meta->p->map_width() < 1) {
         abort();
     }
-    if (map_meta->i->map_height() < 1) {
+    if (map_meta->p->map_height() < 1) {
         abort();
     }
 
     xtimer.Init(RoomXGetTickCount, this, 100, 100);
     xtimer_attacher.xtimer = &xtimer;
-    grid_service.Init(map_meta->i->map_width(),
-                      map_meta->i->map_height(),
+    grid_service.Init(map_meta->p->map_width(),
+                      map_meta->p->map_height(),
                       MAP_CELL_WIDTH);
-    map_service.Init(map_meta->i->map_width() / MAP_GRID_WIDTH,
-                     map_meta->i->map_height() / MAP_GRID_WIDTH,
+    map_service.Init(map_meta->p->map_width() / MAP_GRID_WIDTH,
+                     map_meta->p->map_height() / MAP_GRID_WIDTH,
                      MAP_GRID_WIDTH);
 
     ShuaAndroid();
@@ -228,7 +228,7 @@ void Room::CreateAndroid(int robot_num)
         int try_count = 0;
         while (true) {
             MetaData::Robot& tmp_robot_meta = (*robot_list)[rand() % robot_list->size()];
-            if (refreshed_robot_set_.find(tmp_robot_meta.i->id()) ==
+            if (refreshed_robot_set_.find(tmp_robot_meta.p->id()) ==
                 refreshed_robot_set_.end()) {
                 robot_meta = &tmp_robot_meta;
                 break;
@@ -240,7 +240,7 @@ void Room::CreateAndroid(int robot_num)
         }
 
         Android* hum = new Android();
-        hum->name = robot_meta->i->name();
+        hum->name = robot_meta->p->name();
         hum->meta = hum_meta;
         hum->robot_meta = robot_meta;
         hum->entity_uniid = AllocUniid();
@@ -264,7 +264,7 @@ void Room::CreateAndroid(int robot_num)
             hum->team_members = &team_hash_[hum->team_id];
             hum->team_members->insert(hum);
         }
-        refreshed_robot_set_.insert(robot_meta->i->id());
+        refreshed_robot_set_.insert(robot_meta->p->id());
     }
     #endif
 }
@@ -358,14 +358,14 @@ bool Room::OverBorder(const a8::Vec2 pos, float radius)
             return true;
         }
         int right_x = pos.x + radius;
-        if (right_x > map_meta->i->map_width()) {
+        if (right_x > map_meta->p->map_width()) {
             return true;
         }
     }
     //检查y轴
     {
         int up_y = pos.y + radius;
-        if (up_y > map_meta->i->map_height()) {
+        if (up_y > map_meta->p->map_height()) {
             return true;
         }
         int down_y = pos.y - radius;
diff --git a/server/gameserver/roommgr.cc b/server/gameserver/roommgr.cc
index d5fcd78..a885a84 100644
--- a/server/gameserver/roommgr.cc
+++ b/server/gameserver/roommgr.cc
@@ -98,9 +98,9 @@ void RoomMgr::_CMJoin(f8::MsgHdr& hdr, const cs::CMJoin& msg)
     }
     {
         cs::SMMapInfo notifymsg;
-        notifymsg.set_map_id(room->map_meta->i->map_id());
-        notifymsg.set_map_width(room->map_meta->i->map_width());
-        notifymsg.set_map_height(room->map_meta->i->map_height());
+        notifymsg.set_map_id(room->map_meta->p->map_id());
+        notifymsg.set_map_width(room->map_meta->p->map_width());
+        notifymsg.set_map_height(room->map_meta->p->map_height());
         GGListener::Instance()->SendToClient(hdr.socket_handle, hdr.seqid, notifymsg);
     }
 }
diff --git a/server/gameserver/types.h b/server/gameserver/types.h
index e91ea12..799ed29 100755
--- a/server/gameserver/types.h
+++ b/server/gameserver/types.h
@@ -56,3 +56,13 @@ struct HumanAbility
     float def_add = 0.0f;
     float reflect_damage = 0.0f;
 };
+
+struct SnakeBodyNode
+{
+    int node_id = 0;
+    float speed = 0.0f;
+    a8::Vec2 dir;
+    a8::Vec2 last_move;
+    bool moved = false;
+    struct SnakeBodyNode* pre_node = nullptr;
+};