diff --git a/balloon_scope.h b/balloon_scope.h
deleted file mode 100644
index b779078..0000000
--- a/balloon_scope.h
+++ /dev/null
@@ -1,111 +0,0 @@
-#ifndef __BALLOON_SCOPE_H__
-#define __BALLOON_SCOPE_H__
-
-class balloon_scope
-{
-	private:
-		std::list<var> global;
-		std::list<std::list<std::list<var> > > scope_list;
-	public:
-		void set_clear()
-		{
-			global.clear();
-			scope_list.clear();
-			return;
-		}
-		bool search_var(std::string name)
-		{
-			if(!scope_list.empty())
-			{
-				std::list<std::list<var> >::iterator i=scope_list.back().end();
-				--i;
-				for(;;--i)
-				{
-					for(std::list<var>::iterator j=i->begin();j!=i->end();++j)
-						if(j->get_name()==name)
-							return true;
-					if(i==scope_list.back().begin())
-						break;
-				}
-			}
-			if(!global.empty())
-			{
-				for(std::list<var>::iterator i=global.begin();i!=global.end();++i)
-					if(i->get_name()==name)
-						return true;
-			}
-			return false;
-		}
-		void add_new_var(var t)
-		{
-			if(!scope_list.empty())
-			{
-				std::list<std::list<var> >::iterator i=scope_list.back().end();
-				--i;
-				i->push_back(t);
-				return;
-			}
-			global.push_back(t);
-			return;
-		}
-		var get_var(std::string name)
-		{
-			if(!scope_list.empty())
-			{
-				std::list<std::list<var> >::iterator i=scope_list.back().end();
-				--i;
-				// get the last scope block(std::list<std::list<var> >)
-				for(;;--i)
-				{
-					for(std::list<var>::iterator j=i->begin();j!=i->end();++j)
-						if(j->get_name()==name)
-							return *j;
-					if(i==scope_list.back().begin())
-						break;
-				}
-			}
-			if(!global.empty())
-			{
-				for(std::list<var>::iterator i=global.begin();i!=global.end();++i)
-					if(i->get_name()==name)
-						return *i;
-			}
-			return error_var;
-		}
-		void add_new_block_scope()
-		{
-			std::list<std::list<var> > new_list;
-			scope_list.push_back(new_list);
-			return;
-		}
-		void add_new_local_scope()
-		{
-			if(!scope_list.empty())
-			{
-				std::list<std::list<std::list<var> > >::iterator i=scope_list.end();
-				--i;
-				std::list<var> new_list;
-				i->push_back(new_list);
-			}
-			return;
-		}
-		void pop_last_block_scope()
-		{
-			if(!scope_list.empty())
-				scope_list.pop_back();
-			return;
-		}
-		void pop_last_local_scope()
-		{
-			if(!scope_list.empty())
-			{
-				std::list<std::list<var> > temp=scope_list.back();
-				temp.pop_back();
-			}
-			return;
-		}
-};
-
-balloon_scope scope;
-
-#endif