diff --git a/server/gameserver/android.ai.cc b/server/gameserver/android.ai.cc
index 0d3b38c..048462c 100644
--- a/server/gameserver/android.ai.cc
+++ b/server/gameserver/android.ai.cc
@@ -8,7 +8,14 @@
 
 void AndroidAI::Update(int delta_time)
 {
+    Human* hum = (Human*)owner;
+    if (hum->poisoning) {
+        hum->poisoning_time += delta_time;
+    }
     state_elapsed_time += delta_time;
+    if (hum->poisoning) {
+        hum->UpdatePoisoning();
+    }
     switch (state) {
     case AS_thinking:
         {
diff --git a/server/gameserver/collision.cc b/server/gameserver/collision.cc
index 6b0d03b..bd71195 100644
--- a/server/gameserver/collision.cc
+++ b/server/gameserver/collision.cc
@@ -108,3 +108,8 @@ bool IntersectCircleCircle(Vector2D a_pos, float a_rad, Vector2D b_pos, float b_
     float n = a8::LengthSqr(d);
     return n < t*t;
 }
+
+bool CircleContainCircle(Vector2D a_pos, float a_rad, Vector2D b_pos, float b_rad)
+{
+    return false;
+}
diff --git a/server/gameserver/collision.h b/server/gameserver/collision.h
index 9833694..832106b 100644
--- a/server/gameserver/collision.h
+++ b/server/gameserver/collision.h
@@ -5,4 +5,5 @@ bool IntersectSegmentAabb(Vector2D p0, Vector2D p1, Vector2D _min, Vector2D _max
 bool IntersectAabbCircle(Vector2D a_min, Vector2D a_max, Vector2D b_pos, float b_rad);
 bool IntersectAabbAabb(Vector2D a_min, Vector2D a_max, Vector2D b_min, Vector2D b_max);
 bool IntersectCircleCircle(Vector2D a_pos, float a_rad, Vector2D b_pos, float b_rad);
+bool CircleContainCircle(Vector2D a_pos, float a_rad, Vector2D b_pos, float b_rad);
 void TestGlm();
diff --git a/server/gameserver/human.cc b/server/gameserver/human.cc
index 0053c02..2c6961c 100644
--- a/server/gameserver/human.cc
+++ b/server/gameserver/human.cc
@@ -205,3 +205,28 @@ float Human::GetRadius()
 {
     return meta->i->radius();
 }
+
+void Human::UpdatePoisoning()
+{
+    if (dead) {
+        return;
+    }
+    bool need_notify = poisoning_time > 1000;
+    while (poisoning_time > 1000) {
+        if (room->gas_data.is_last_gas) {
+            health = std::max(0.0f, health - room->gas_data.new_area_meta->i->hurt());
+        } else {
+            health = std::max(0.0f, health - room->gas_data.old_area_meta->i->hurt());
+        }
+        if (health <= 0.0f) {
+            dead = true;
+            downed = true;
+            poisoning_time = 0;
+            break;
+        }
+        poisoning_time -= 1000;
+    }
+    if (need_notify && entity_subtype != EST_Player) {
+        this->new_objects.insert(this);
+    }
+}
diff --git a/server/gameserver/human.h b/server/gameserver/human.h
index 00e74e3..9b966fb 100644
--- a/server/gameserver/human.h
+++ b/server/gameserver/human.h
@@ -43,6 +43,8 @@ class Human : public Entity
     int energy_shield = 0;
     int vip = 0;
     int sdmg = 0;
+    bool poisoning = false;
+    long long poisoning_time = 0;
 
     HumanFrameData frame_data;
 
@@ -63,6 +65,7 @@ class Human : public Entity
     ColliderComponent* GetFirstCollision();
     void FindPath();
     float GetRadius();
+    void UpdatePoisoning();
 
 private:
     CircleCollider* self_collider_ = nullptr;
diff --git a/server/gameserver/player.cc b/server/gameserver/player.cc
index 93b9f2b..0c1f613 100644
--- a/server/gameserver/player.cc
+++ b/server/gameserver/player.cc
@@ -56,6 +56,9 @@ void Player::Initialize()
 
 void Player::Update(int delta_time)
 {
+    if (poisoning) {
+        poisoning_time += delta_time;
+    }
     movement->Update(delta_time);
     if (moving) {
         UpdateMove();
@@ -67,6 +70,9 @@ void Player::Update(int delta_time)
         if (interaction_objids.size() > 0) {
             ProcInteraction();
         }
+        if (poisoning) {
+            UpdatePoisoning();
+        }
         MakeUpdateMsg();
         SendNotifyMsg(*update_msg);
         {
diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index 25cc1f3..00e9479 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -12,6 +12,7 @@
 #include "obstacle.h"
 #include "building.h"
 #include "loot.h"
+#include "collision.h"
 
 const int ROOM_MAX_PLAYER_NUM = 50;
 const int ANDROID_NUM = 0;
@@ -509,9 +510,27 @@ void Room::UpdateGas()
         }
         break;
     }
-    if (gas_data.gas_mode == GasInactive) {
+    if (gas_data.gas_mode != GasInactive) {
         for (auto& pair : human_hash_) {
-
+            if (pair.second->dead) {
+                continue;
+            }
+            if (!CircleContainCircle(gas_data.pos_old,
+                                     gas_data.rad_old,
+                                     pair.second->pos,
+                                     pair.second->GetRadius()
+                                     ) &&
+                !CircleContainCircle(gas_data.pos_new,
+                                     gas_data.rad_new,
+                                     pair.second->pos,
+                                     pair.second->GetRadius()
+                                     )
+                ) {
+                pair.second->poisoning = true;
+            } else {
+                pair.second->poisoning = false;
+                pair.second->poisoning_time = false;
+            }
         }
     }
 }