diff --git a/server/gameserver/bullet.cc b/server/gameserver/bullet.cc
index 342c005..af795f5 100644
--- a/server/gameserver/bullet.cc
+++ b/server/gameserver/bullet.cc
@@ -305,22 +305,34 @@ void Bullet::MapServiceUpdate()
         return;
     }
     if (sender.Get()) {
-        SetPos(GetPos() + dir * gun_meta->i->bullet_speed() / (float)SERVER_FRAME_RATE);
-        float distance = (GetPos() - born_pos).Norm();
-        if (room->OverBorder(GetPos(), gun_meta->i->bullet_rad())) {
-            if (IsBomb()) {
-                ProcBomb();
-            } else {
-                Check(distance);
-                if (!later_removed_) {
-                    room->RemoveObjectLater(this);
-                    later_removed_ = true;
+        float move_length = gun_meta->i->bullet_speed() / (float)SERVER_FRAME_RATE;
+        do {
+            float step_len = move_length - MetaMgr::Instance()->bullet_planck_step_length;
+            if (step_len <= 0.001f) {
+                if (move_length > 0.1f) {
+                    step_len = move_length;
+                } else {
+                    break;
                 }
             }
-        } else {
-            room->grid_service->MoveBullet(this);
-            Check(distance);
-        }
+            move_length -= step_len;
+            SetPos(GetPos() + dir * step_len);
+            float distance = (GetPos() - born_pos).Norm();
+            if (room->OverBorder(GetPos(), gun_meta->i->bullet_rad())) {
+                if (IsBomb()) {
+                    ProcBomb();
+                } else {
+                    Check(distance);
+                    if (!later_removed_) {
+                        room->RemoveObjectLater(this);
+                        later_removed_ = true;
+                    }
+                }
+            } else {
+                room->grid_service->MoveBullet(this);
+                Check(distance);
+            }
+        } while(!later_removed_ && move_length >= 0.0001f);
     } else {
         room->RemoveObjectLater(this);
         later_removed_ = true;
@@ -356,41 +368,6 @@ void Bullet::Check(float distance)
     int c_hit_num = 0;
     int t_hit_num = 0;
     std::set<Entity*> objects;
-    room->grid_service->TraverseCreatures
-        (room->GetRoomIdx(),
-         GetGridList(),
-         [this, &objects, &c_hit_num] (Creature* c, bool& stop)
-         {
-             if (sender.Get()->IsProperTarget(c)) {
-                 if (gun_meta->i->ispenetrate() &&
-                     hit_objects_.find(c->GetUniId()) != hit_objects_.end()) {
-                     //穿人
-                     return;
-                 }
-                 if (c->HasBuffEffect(kBET_BulletThrough)) {
-                     return;
-                 }
-                 AabbCollider aabb_box;
-                 c->GetHitAabbBox(aabb_box);
-                 if (c != sender.Get() && !c->dead && TestCollision(room, &aabb_box)) {
-                     if (meta->i->_inventory_slot() == IS_C4) {
-                         if (!c->IsHuman()) {
-                             objects.insert(c);
-                             if (gun_meta->i->ispenetrate()) {
-                                 ++c_hit_num;
-                                 hit_objects_.insert(c->GetUniId());
-                             }
-                         }
-                     } else {
-                         objects.insert(c);
-                         if (gun_meta->i->ispenetrate()) {
-                             ++c_hit_num;
-                             hit_objects_.insert(c->GetUniId());
-                         }
-                     }
-                 }
-             }
-         });
     {
         std::set<ColliderComponent*> colliders;
         room->map_service->GetColliders(room, GetX(), GetY(), colliders);
@@ -418,6 +395,43 @@ void Bullet::Check(float distance)
             }
         }
     }
+    if (t_hit_num <= 0) {
+        room->grid_service->TraverseCreatures
+            (room->GetRoomIdx(),
+             GetGridList(),
+             [this, &objects, &c_hit_num] (Creature* c, bool& stop)
+             {
+                 if (sender.Get()->IsProperTarget(c)) {
+                     if (gun_meta->i->ispenetrate() &&
+                         hit_objects_.find(c->GetUniId()) != hit_objects_.end()) {
+                         //穿人
+                         return;
+                     }
+                     if (c->HasBuffEffect(kBET_BulletThrough)) {
+                         return;
+                     }
+                     AabbCollider aabb_box;
+                     c->GetHitAabbBox(aabb_box);
+                     if (c != sender.Get() && !c->dead && TestCollision(room, &aabb_box)) {
+                         if (meta->i->_inventory_slot() == IS_C4) {
+                             if (!c->IsHuman()) {
+                                 objects.insert(c);
+                                 if (gun_meta->i->ispenetrate()) {
+                                     ++c_hit_num;
+                                     hit_objects_.insert(c->GetUniId());
+                                 }
+                             }
+                         } else {
+                             objects.insert(c);
+                             if (gun_meta->i->ispenetrate()) {
+                                 ++c_hit_num;
+                                 hit_objects_.insert(c->GetUniId());
+                             }
+                         }
+                     }
+                 }
+             });
+    }
     float bullet_range = gun_meta->i->range();
     if (gun_upgrade_meta && gun_upgrade_meta->GetAttrValue(gun_lv, kHAT_ShotRange) > 0) {
         bullet_range += gun_upgrade_meta->GetAttrValue(gun_lv, kHAT_ShotRange);
diff --git a/server/gameserver/metamgr.cc b/server/gameserver/metamgr.cc
index f81c109..04aa901 100644
--- a/server/gameserver/metamgr.cc
+++ b/server/gameserver/metamgr.cc
@@ -203,6 +203,7 @@ public:
             MetaMgr::Instance()->newbie_fill_interval = MetaMgr::Instance()->GetSysParamAsInt("newbie_fill_interval", 5000);
             MetaMgr::Instance()->other_fill_interval = MetaMgr::Instance()->GetSysParamAsInt("other_fill_interval", 2000);
             MetaMgr::Instance()->map_cell_width = MetaMgr::Instance()->GetSysParamAsInt("map_cell_width", 64 * 8);
+            MetaMgr::Instance()->bullet_planck_step_length = std::max(15, MetaMgr::Instance()->GetSysParamAsInt("bullet_planck_step_length", 15));
             METAMGR_READ(zbmode_gas_inactive_time, 25);
             METAMGR_READ(zbmode_game_duration, 300);
             METAMGR_READ(zbmode_player_num, 15);
diff --git a/server/gameserver/metamgr.h b/server/gameserver/metamgr.h
index 672cf10..dbfb669 100644
--- a/server/gameserver/metamgr.h
+++ b/server/gameserver/metamgr.h
@@ -170,6 +170,7 @@ class MetaMgr : public a8::Singleton<MetaMgr>
     float android_pursuit_range = 0;
     float android_patrol_range = 0;
     int map_cell_width = 64 * 8;
+    int bullet_planck_step_length = 15;
     MetaData::Player* human_meta = nullptr;
     MetaData::Player* android_meta = nullptr;
     MetaData::Player* terminator_meta = nullptr;