diff --git a/server/gameserver/buff.cc b/server/gameserver/buff.cc
index 6d175d36..50ad20c4 100644
--- a/server/gameserver/buff.cc
+++ b/server/gameserver/buff.cc
@@ -77,7 +77,7 @@ int Buff::GetLeftTime()
 
 int Buff::GetLastingTime()
 {
-    return meta->GetDurationTime(skill_meta) * 1000;
+    return meta->GetDurationTime(owner, skill_meta) * 1000;
 }
 
 void Buff::InternalTimerAddBuff()
diff --git a/server/gameserver/creature.cc b/server/gameserver/creature.cc
index 1b2ac97b..b4b3b81f 100644
--- a/server/gameserver/creature.cc
+++ b/server/gameserver/creature.cc
@@ -275,7 +275,7 @@ int Creature::AddBuff(Creature* caster,
     {
         buff->remover_timer = room->xtimer.SetTimeoutWpEx
             (
-             buff_meta->GetDurationTime(buff_skill_meta) * SERVER_FRAME_RATE,
+             buff_meta->GetDurationTime(this, buff_skill_meta) * SERVER_FRAME_RATE,
              [buff_wp = (std::weak_ptr<Buff>)buff] (int event, const a8::Args* args)
              {
                  if (a8::TIMER_EXEC_EVENT == event) {
diff --git a/server/gameserver/mt/Buff.cc b/server/gameserver/mt/Buff.cc
index 4e2f0a04..ac618697 100644
--- a/server/gameserver/mt/Buff.cc
+++ b/server/gameserver/mt/Buff.cc
@@ -1,5 +1,7 @@
 #include "precompile.h"
 
+#include "lispenv.h"
+
 #include "mt/Buff.h"
 #include "mt/Hero.h"
 
@@ -319,11 +321,44 @@ namespace mt
         }
     }
 
-    float Buff::GetDurationTime(const mt::Skill* skill_meta) const
+    float Buff::GetDurationTime(Creature* c, const mt::Skill* skill_meta) const
     {
+        if (_duration_time_expr) {
+            return LispEnv::Instance()->EvalSkillNumberExpr
+                (
+                 _duration_time_expr,
+                 c,
+                 skill_meta
+                 );
+        }
         return 0.0f;
     }
 
+    float Buff::GetBuffParam1(Creature* c, const mt::Skill* skill_meta) const
+    {
+
+    }
+
+    float Buff::GetBuffParam2(Creature* c, const mt::Skill* skill_meta) const
+    {
+
+    }
+
+    float Buff::GetBuffParam3(Creature* c, const mt::Skill* skill_meta) const
+    {
+
+    }
+
+    float Buff::GetBuffParam4(Creature* c, const mt::Skill* skill_meta) const
+    {
+
+    }
+
+    float Buff::GetBuffParam5(Creature* c, const mt::Skill* skill_meta) const
+    {
+
+    }
+
     std::string Buff::duration_time() const
     {
         return mtb::Buff::duration_time();
diff --git a/server/gameserver/mt/Buff.h b/server/gameserver/mt/Buff.h
index 780d3eb8..3df3bace 100644
--- a/server/gameserver/mt/Buff.h
+++ b/server/gameserver/mt/Buff.h
@@ -12,6 +12,7 @@ namespace a8
 
 }
 
+class Creature;
 namespace mt
 {
 
@@ -53,11 +54,21 @@ namespace mt
 
         std::vector<int> _child_buff_list;
 
-        float GetDurationTime(const mt::Skill* skill_meta) const;
+        float GetDurationTime(Creature* c, const mt::Skill* skill_meta) const;
+        float GetBuffParam1(Creature* c, const mt::Skill* skill_meta) const;
+        float GetBuffParam2(Creature*, const mt::Skill* skill_meta) const;
+        float GetBuffParam3(Creature* c, const mt::Skill* skill_meta) const;
+        float GetBuffParam4(Creature* c, const mt::Skill* skill_meta) const;
+        float GetBuffParam5(Creature* c, const mt::Skill* skill_meta) const;
 
     private:
         float _duration_time = 0.0f;
         std::shared_ptr<a8::lisp::Value> _duration_time_expr;
+        std::shared_ptr<a8::lisp::Value> _buff_param1_expr;
+        std::shared_ptr<a8::lisp::Value> _buff_param2_expr;
+        std::shared_ptr<a8::lisp::Value> _buff_param3_expr;
+        std::shared_ptr<a8::lisp::Value> _buff_param4_expr;
+        std::shared_ptr<a8::lisp::Value> _buff_param5_expr;
 
         std::string duration_time() const;