diff --git a/server/gameserver/human.cc b/server/gameserver/human.cc
index 48cbb0d..cc9ce9f 100644
--- a/server/gameserver/human.cc
+++ b/server/gameserver/human.cc
@@ -492,12 +492,52 @@ void Human::BeKill(int killer_id, const std::string& killer_name)
 
 void Human::DecHP(float dec_hp, int killer_id, const std::string& killer_name)
 {
+    auto downed_func = [] (const a8::XParams& param)
+                       {
+                           Human* hum = (Human*)param.sender.GetUserData();
+                           if (!hum->downed) {
+                               hum->room->xtimer.DeleteTimer(hum->downed_timer);
+                               return;
+                           }
+                           if (hum->dead) {
+                               return;
+                           }
+                           if (!hum->HasLiveTeammate()) {
+                               hum->BeKill(param.param1, param.param2);
+                               return;
+                           }
+                           int dec_hp = MetaMgr::Instance()->GetSysParamAsInt("downed_dec_hp");
+                           hum->DecHP(dec_hp, param.param1, param.param2);
+                       };
     if (energy_shield > 0.001f) {
         energy_shield = std::max(0.0f, energy_shield - dec_hp);
     } else {
         health = std::max(0.0f, health - dec_hp);
-        if (health <= 0.0001f) {
-            BeKill(killer_id, killer_name);
+        if (health <= 0.0001f && !dead) {
+            if (downed) {
+                if (downed_timer) {
+                    room->xtimer.DeleteTimer(downed_timer);
+                }
+                downed = false;
+                downed_timer = nullptr;
+                BeKill(killer_id, killer_name);
+            } else {
+                if (HasLiveTeammate()) {
+                    health = MetaMgr::Instance()->GetSysParamAsInt("downed_recover_hp");
+                    downed = true;
+                    downed_timer = room->xtimer.AddRepeatTimerAndAttach(
+                                                                        SERVER_FRAME_RATE,
+                                                                        a8::XParams()
+                                                                        .SetSender(this)
+                                                                        .SetParam1(killer_id)
+                                                                        .SetParam2(killer_name),
+                                                                        downed_func,
+                                                                        &xtimer_attacher.timer_list_
+                                                                        );
+                } else {
+                    BeKill(killer_id, killer_name);
+                }
+            }
         }
     }
     SyncAroundPlayers();
@@ -522,3 +562,15 @@ void Human::RemovePartObjects(Entity* entity)
 {
     part_objects.erase(entity);
 }
+
+bool Human::HasLiveTeammate()
+{
+    if (team_members) {
+        for (auto& hum : *team_members) {
+            if (!hum->dead) {
+                return true;
+            }
+        }
+    }
+    return false;
+}
diff --git a/server/gameserver/human.h b/server/gameserver/human.h
index a8f5b83..3eb700f 100644
--- a/server/gameserver/human.h
+++ b/server/gameserver/human.h
@@ -76,6 +76,8 @@ class Human : public Entity
     int pain_killer_lastingtime = 0;
     xtimer_list* pain_killer_timer = nullptr;
 
+    xtimer_list* downed_timer = nullptr;
+
     std::set<Human*>* team_members = nullptr;
 
     Human();
@@ -109,6 +111,7 @@ class Human : public Entity
     void AddToPartObjects(Entity* entity);
     void RemoveNewObjects(Entity* entity);
     void RemovePartObjects(Entity* entity);
+    bool HasLiveTeammate();
 
 protected:
     long long last_shot_frameno_ = 0;
diff --git a/server/gameserver/player.cc b/server/gameserver/player.cc
index 642a28f..2f9acde 100644
--- a/server/gameserver/player.cc
+++ b/server/gameserver/player.cc
@@ -82,6 +82,9 @@ void Player::Update(int delta_time)
 
 void Player::UpdateMove()
 {
+    if (action_type == AT_Relive) {
+        CancelAction();
+    }
     ++moved_frames;
     if (moved_frames > 4) {
         moving = false;
@@ -243,6 +246,24 @@ void Player::UpdateAction()
                         }
                     }
                     break;
+                case AT_Relive:
+                    {
+                        Entity* entity = room->GetEntityByUniId(action_target_id);
+                        if (entity->entity_type != ET_Player) {
+                            return;
+                        }
+                        Human* hum = (Human*)entity;
+                        if (!hum->dead && hum->downed) {
+                            hum->health = MetaMgr::Instance()->GetSysParamAsInt("downed_relive_recover_hp");
+                            hum->downed = false;
+                            if (hum->downed_timer) {
+                                room->xtimer.DeleteTimer(hum->downed_timer);
+                                hum->downed_timer = nullptr;
+                            }
+                            SyncAroundPlayers();
+                        }
+                    }
+                    break;
                 default:
                     {
                     }
@@ -472,6 +493,11 @@ void Player::ProcInteraction()
                     LootInteraction((Loot*)entity);
                 }
                 break;
+            case ET_Player:
+                {
+                    HumanInteraction((Human*)entity);
+                }
+                break;
             default:
                 break;
             }
@@ -651,6 +677,22 @@ void Player::LootInteraction(Loot* entity)
     room->AddDeletedObject(entity->entity_uniid, false);
 }
 
+void Player::HumanInteraction(Human* hum)
+{
+    if (hum == this) {
+        return;
+    }
+    if (!hum->downed) {
+        return;
+    }
+    StartAction(
+                AT_Relive,
+                MetaMgr::Instance()->GetSysParamAsInt("downed_relive_time") * 1000,
+                room->frame_no,
+                hum->entity_uniid
+                );
+}
+
 void Player::SendUpdateMsg()
 {
     MakeUpdateMsg();
diff --git a/server/gameserver/player.h b/server/gameserver/player.h
index d82030e..36a7057 100644
--- a/server/gameserver/player.h
+++ b/server/gameserver/player.h
@@ -86,6 +86,7 @@ class Player : public Human
     void ProcInteraction();
     void ObstacleInteraction(Obstacle* entity);
     void LootInteraction(Loot* entity);
+    void HumanInteraction(Human* hum);
     void SendUpdateMsg();
 
     void _CMMove(f8::MsgHdr& hdr, const cs::CMMove& msg);