diff --git a/server/gameserver/collider.cc b/server/gameserver/collider.cc
index c16e327..a90156e 100644
--- a/server/gameserver/collider.cc
+++ b/server/gameserver/collider.cc
@@ -95,3 +95,91 @@ bool ColliderComponent::Intersect(ColliderComponent* b)
     }
     return false;
 }
+
+bool ColliderComponent::CalcSafePoint(ColliderComponent* b, Vector2D& new_pos)
+{
+    switch (type) {
+    case CT_None:
+        break;
+    case CT_Aabb:
+        {
+            AabbCollider* a_aabb = (AabbCollider*)this;
+            switch (b->type) {
+            case CT_Aabb:
+                {
+                    AabbCollider* b_aabb = (AabbCollider*)this;
+                    return CalcAabbAabbSafePoint(a_aabb->owner->pos + a_aabb->_min,
+                                                 a_aabb->owner->pos + a_aabb->_max,
+                                                 b_aabb->owner->pos + b_aabb->_min,
+                                                 b_aabb->owner->pos + b_aabb->_max,
+                                                 new_pos);
+                }
+                break;
+            case CT_Circle:
+                {
+                    CircleCollider* b_circle = (CircleCollider*)b;
+                    return CalcAabbAabbSafePoint(a_aabb->owner->pos + a_aabb->_min,
+                                                 a_aabb->owner->pos + a_aabb->_max,
+                                                 b_circle->owner->pos + b_circle->pos,
+                                                 b_circle->rad,
+                                                 new_pos);
+                }
+                break;
+            }
+        }
+        break;
+    case CT_Circle:
+        {
+            CircleCollider* a_circle = (CircleCollider*)this;
+            switch (b->type) {
+            case CT_Aabb:
+                {
+                    AabbCollider* b_aabb = (AabbCollider*)b;
+                    return CalcCircleAabbSafePoint(
+                                                   a_circle->owner->pos + a_circle->pos,
+                                                   a_circle->rad,
+                                                   b_aabb->owner->pos + b_aabb->_min,
+                                                   b_aabb->owner->pos + b_aabb->_max,
+                                                   new_pos);
+                }
+                break;
+            case CT_Circle:
+                {
+                    CircleCollider* b_circle = (CircleCollider*)b;
+                    return CalcCircleCircleSafePoint(
+                                                     a_circle->owner->pos + a_circle->pos,
+                                                     a_circle->rad,
+                                                     b_circle->owner->pos + b_circle->pos,
+                                                     b_circle->rad,
+                                                     new_pos);
+                }
+                break;
+            }
+        }
+        break;
+    default:
+        break;
+    }
+    return false;
+}
+
+void DestoryCollider(ColliderComponent* collider)
+{
+    switch (collider->type) {
+    case CT_Aabb:
+        {
+            delete (AabbCollider*)collider;
+        }
+        break;
+    case CT_Circle:
+        {
+            delete (CircleCollider*)collider;
+        }
+        break;
+    default:
+        {
+            delete collider;
+        }
+        break;
+    }
+}
diff --git a/server/gameserver/collider.h b/server/gameserver/collider.h
index cabbe89..bf70524 100644
--- a/server/gameserver/collider.h
+++ b/server/gameserver/collider.h
@@ -17,6 +17,7 @@ class ColliderComponent
 
     bool Intersect(ColliderComponent* b);
     bool IntersectSegment(Vector2D& p0, Vector2D& p1);
+    bool CalcSafePoint(ColliderComponent* b, Vector2D& new_pos);
 };
 
 class AabbCollider : public ColliderComponent
@@ -36,3 +37,5 @@ public:
 
     CircleCollider() { type = CT_Circle; };
 };
+
+void DestoryCollider(ColliderComponent* collider);
diff --git a/server/gameserver/collision.cc b/server/gameserver/collision.cc
index df975ca..897564c 100644
--- a/server/gameserver/collision.cc
+++ b/server/gameserver/collision.cc
@@ -115,36 +115,69 @@ bool CircleContainCircle(Vector2D a_pos, float a_rad, Vector2D b_pos, float b_ra
     return distance < a_rad - b_rad;
 }
 
-bool CalcCircleAabbSafePoint(Vector2D a_min, Vector2D a_max, Vector2D b_pos, float b_rad,
+bool CalcCircleAabbSafePoint(Vector2D a_pos, float b_rad, Vector2D b_min, Vector2D b_max,
                              Vector2D& new_pos)
 {
-    new_pos = b_pos;
-    bool at_left = std::abs(b_pos.x - a_min.x) < std::abs(b_pos.x - a_max.x);
-    bool at_down = std::abs(b_pos.y - a_min.y) < std::abs(b_pos.y - a_max.y);
-    float x_len = at_left ? std::abs(b_pos.x - a_min.x) : std::abs(b_pos.x - a_max.x);
-    float y_len = at_down ? std::abs(b_pos.y - a_min.y) : std::abs(b_pos.y - a_max.y);
+    new_pos = a_pos;
+    bool at_left = std::abs(a_pos.x - b_min.x) < std::abs(a_pos.x - b_max.x);
+    bool at_down = std::abs(a_pos.y - b_min.y) < std::abs(a_pos.y - b_max.y);
+    float x_len = at_left ? std::abs(a_pos.x - b_min.x) : std::abs(a_pos.x - b_max.x);
+    float y_len = at_down ? std::abs(a_pos.y - b_min.y) : std::abs(a_pos.y - b_max.y);
     if (at_left) {
         if (x_len < y_len) {
             //左
-            new_pos.x = a_min.x - b_rad - 1;
+            new_pos.x = b_min.x - b_rad - 1;
         } else {
             if (at_down) {
-                new_pos.y = a_min.y - b_rad - 1;
+                new_pos.y = b_min.y - b_rad - 1;
             } else {
-                new_pos.y = a_max.y + b_rad + 1;
+                new_pos.y = b_max.y + b_rad + 1;
             }
         }
     } else {
         if (x_len < y_len) {
             //右
-            new_pos.x = a_max.x + b_rad + 1;
+            new_pos.x = b_max.x + b_rad + 1;
         } else {
             if (at_down) {
-                new_pos.y = a_min.y - b_rad - 1;
+                new_pos.y = b_min.y - b_rad - 1;
             } else {
-                new_pos.y = a_max.y + b_rad + 1;
+                new_pos.y = b_max.y + b_rad + 1;
             }
         }
     }
     return true;
 }
+
+bool CalcCircleCircleSafePoint(Vector2D a_pos, float a_rad, Vector2D b_pos, float b_rad,
+                               Vector2D& new_pos)
+{
+    Vector2D dir = a_pos - b_pos;
+    dir.Normalize();
+    new_pos = b_pos + dir*(a_rad + b_rad) + 1;
+    return true;
+}
+
+bool CalcAabbAabbSafePoint(Vector2D a_min, Vector2D a_max, Vector2D b_min, Vector2D b_max,
+                           Vector2D& new_pos)
+{
+    Vector2D a_pos = a_min + (a_max - a_min)/2.0f;
+    float a_rad = (a_max - a_min).Norm();
+    Vector2D b_pos = b_min + (b_max - b_min)/2.0f;
+    float b_rad = (b_max - b_min).Norm();
+    Vector2D dir = (a_pos - b_pos);
+    dir.Normalize();
+    new_pos = b_pos + dir*(a_rad + b_rad) + 1;
+    return true;
+}
+
+bool CalcAabbCircleSafePoint(Vector2D a_min, Vector2D a_max, Vector2D b_pos, float b_rad,
+                             Vector2D& new_pos)
+{
+    Vector2D a_pos = a_min + (a_max - a_min)/2.0f;
+    float a_rad = (a_max - a_min).Norm();
+    Vector2D dir = a_pos - b_pos;
+    dir.Normalize();
+    new_pos = b_pos + dir*(a_rad + b_rad) + 1;
+    return true;
+}
diff --git a/server/gameserver/collision.h b/server/gameserver/collision.h
index e5a06e1..d73119b 100644
--- a/server/gameserver/collision.h
+++ b/server/gameserver/collision.h
@@ -6,6 +6,12 @@ bool IntersectAabbCircle(Vector2D a_min, Vector2D a_max, Vector2D b_pos, float b
 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);
-bool CalcCircleAabbSafePoint(Vector2D a_min, Vector2D a_max, Vector2D b_pos, float b_rad,
+bool CalcCircleAabbSafePoint(Vector2D a_pos, float a_rad, Vector2D b_min, Vector2D b_max,
+                             Vector2D& new_pos);
+bool CalcCircleCircleSafePoint(Vector2D a_pos, float a_rad, Vector2D b_pos, float b_rad,
+                               Vector2D& new_pos);
+bool CalcAabbAabbSafePoint(Vector2D a_min, Vector2D a_max, Vector2D b_min, Vector2D b_max,
+                           Vector2D& new_pos);
+bool CalcAabbCircleSafePoint(Vector2D a_min, Vector2D a_max, Vector2D b_pos, float b_rad,
                              Vector2D& new_pos);
 void TestGlm();
diff --git a/server/gameserver/entity.cc b/server/gameserver/entity.cc
index f63e218..0d1c89a 100644
--- a/server/gameserver/entity.cc
+++ b/server/gameserver/entity.cc
@@ -3,6 +3,7 @@
 #include "entity.h"
 #include "collider.h"
 #include "room.h"
+#include "building.h"
 
 Entity::Entity()
 {
@@ -19,6 +20,14 @@ void Entity::Initialize()
     xtimer_attacher.xtimer = &room->xtimer;
 }
 
+ColliderComponent* Entity::GetBoxBound()
+{
+    CircleCollider* collider = new CircleCollider();
+    collider->active = true;
+    collider->owner = this;
+    return collider;
+}
+
 bool Entity::TestCollision(Entity* b)
 {
     for (auto& a_collider : colliders) {
@@ -35,23 +44,64 @@ void Entity::ClearColliders()
 {
     for (auto& itr : colliders) {
         ColliderComponent* collider = itr;
-        switch (collider->type) {
-        case CT_Aabb:
-            {
-                delete (AabbCollider*)collider;
-            }
-            break;
-        case CT_Circle:
-            {
-                delete (CircleCollider*)collider;
-            }
-            break;
-        default:
-            {
-                delete collider;
-            }
-            break;
-        }
+        DestoryCollider(collider);
     }
     colliders.clear();
 }
+
+void Entity::FindLocationWithTarget(Entity* target)
+{
+    ColliderComponent* a_collider = GetBoxBound();
+    Vector2D old_pos = pos;
+    Vector2D new_pos = pos;
+    #if 0
+    {
+        std::vector<Entity*> objects;
+        room->BuildingBoxBoundCollisionDetection(this, objects);
+        if (objects.size() > 1) {
+            abort();
+        }
+        if (!objects.empty()) {
+            Building* building = (Building*)objects[0];
+            ColliderComponent* building_collider = building->GetBoxBound();
+            bool ret = a_collider->CalcSafePoint(building_collider, new_pos);
+            if (!ret) {
+                abort();
+            }
+            if (ret) {
+                pos = new_pos;
+                DestoryCollider(a_collider);
+                DestoryCollider(building_collider);
+                return;
+            } else {
+                DestoryCollider(building_collider);
+            }
+        }
+    }
+    #endif
+    ColliderComponent* target_collider = target->GetBoxBound();
+    {
+        bool ret = a_collider->CalcSafePoint(target_collider, new_pos);
+        if (!ret) {
+            abort();
+        }
+    }
+    Vector2D new_pos_dir = new_pos - old_pos;
+    float distance = (new_pos - old_pos).Norm();
+    new_pos_dir.Normalize();
+    for (float i = distance; i < 10000000; i += 5.0f) {
+        pos = old_pos + new_pos_dir * i;
+        std::vector<Entity*> objects;
+        int detection_flags = 0;
+        {
+            a8::SetBitFlag(detection_flags, ET_Obstacle);
+        }
+        room->CollisionDetection(this, detection_flags, objects);
+        if (objects.empty()) {
+            break;
+        }
+    }
+
+    DestoryCollider(target_collider);
+    DestoryCollider(a_collider);
+}
diff --git a/server/gameserver/entity.h b/server/gameserver/entity.h
index 617a5db..73fad18 100644
--- a/server/gameserver/entity.h
+++ b/server/gameserver/entity.h
@@ -57,6 +57,9 @@ class Entity
     virtual void FillMFObjectPart(cs::MFObjectPart* part_data) {};
     virtual void FillMFObjectFull(cs::MFObjectFull* full_data) {};
     virtual float GetSpeed() { return 1.0f;};
+    virtual ColliderComponent* GetBoxBound();
     bool TestCollision(Entity* b);
     void ClearColliders();
+    void FindLocationWithTarget(Entity* target);
+
 };
diff --git a/server/gameserver/human.cc b/server/gameserver/human.cc
index 1abce4e..957e30b 100644
--- a/server/gameserver/human.cc
+++ b/server/gameserver/human.cc
@@ -323,7 +323,6 @@ ColliderComponent* Human::GetFirstCollision()
 
 void Human::FindPath()
 {
-    ColliderComponent* first_collider = nullptr;
     Vector2D old_pos = pos;
     {
         float up_dot = Vector2D::UP.Dot(move_dir);
@@ -649,20 +648,20 @@ void Human::FindLocation()
         }
         if (!objects.empty()) {
             Building* building = (Building*)objects[0];
-            Vector2D a_min = Vector2D(
+            Vector2D b_min = Vector2D(
                                       building->pos.x - building->meta->i->tilewidth()/2.0,
                                       building->pos.y - building->meta->i->tileheight()/2.0
                                       );
-            Vector2D a_max = Vector2D(
+            Vector2D b_max = Vector2D(
                                       building->pos.x + building->meta->i->tilewidth()/2.0,
                                       building->pos.y + building->meta->i->tileheight()/2.0
                                       );
             Vector2D new_pos;
             bool ret = CalcCircleAabbSafePoint(
-                                               a_min,
-                                               a_max,
                                                pos,
                                                GetRadius(),
+                                               b_min,
+                                               b_max,
                                                new_pos
                                                );
             if (!ret) {
@@ -670,7 +669,27 @@ void Human::FindLocation()
             }
             if (ret) {
                 pos = new_pos;
+                return;
             }
         }
     }
+    {
+        std::vector<Entity*> objects;
+        int detection_flags = 0;
+        {
+            a8::SetBitFlag(detection_flags, ET_Obstacle);
+            a8::SetBitFlag(detection_flags, ET_Player);
+        }
+        room->CollisionDetection(this, detection_flags, objects);
+        if (objects.empty()) {
+            return;
+        }
+        std::sort(objects.begin(), objects.end(),
+                  [this] (Entity* a, Entity *b) -> bool
+                  {
+                      return (this->pos - a->pos).Norm() < (this->pos - b->pos).Norm();
+                  });
+        Entity* target = objects[0];
+        FindLocationWithTarget(target);
+    }
 }
diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index 6d06fd4..e199fb9 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -762,6 +762,21 @@ void Room::TouchHumanList(a8::XParams param,
     }
 }
 
+void Room::TouchEntityList(a8::XParams param,
+                           std::function<bool (Entity*, a8::XParams&)> func)
+{
+    if (!func) {
+        return;
+    }
+    for (auto& pair : uniid_hash_) {
+        if (pair.second) {
+            if (!func(pair.second, param)) {
+                break;
+            }
+        }
+    }
+}
+
 void Room::ProcAddedObjects()
 {
     if (!be_added_hash_.empty()) {
diff --git a/server/gameserver/room.h b/server/gameserver/room.h
index 351884e..adb1176 100644
--- a/server/gameserver/room.h
+++ b/server/gameserver/room.h
@@ -65,6 +65,8 @@ public:
                          std::function<void (Player*, a8::XParams&)> func);
     void TouchHumanList(a8::XParams param,
                         std::function<bool (Human*, a8::XParams&)> func);
+    void TouchEntityList(a8::XParams param,
+                         std::function<bool (Entity*, a8::XParams&)> func);
 
     void ScatterDrop(Vector2D center, int drop_id);
     void DropItem(Vector2D pos, int item_id, int item_count);