diff --git a/balloon/abstract_syntax_tree.cpp b/balloon/abstract_syntax_tree.cpp
index cf853b1..4f4b467 100644
--- a/balloon/abstract_syntax_tree.cpp
+++ b/balloon/abstract_syntax_tree.cpp
@@ -5,7 +5,6 @@
 
 int exit_type=0;
 std::stack<var> ret_stack; // for function ret use
-std::list<var> parameter;  // for function call use
 
 
 var abstract_syntax_tree::calculation()
@@ -469,10 +468,10 @@ var abstract_syntax_tree::call_identifier()
 			}
 			else if(i->type==__call_function && temp.get_type()==__var_function)
 			{
-				parameter.clear();
+				std::list<var> parameter;
 				for(std::list<abstract_syntax_tree>::iterator j=i->children.begin();j!=i->children.end();++j)
 					parameter.push_back(j->calculation());
-				temp=temp.get_function().run_func();
+				temp=temp.get_function().run_func(parameter);
 			}
 			else
 			{
@@ -738,7 +737,7 @@ int abstract_syntax_tree::run_ifelse()
 	return ret;
 }
 
-var abstract_syntax_tree::run_func()
+var abstract_syntax_tree::run_func(std::list<var> parameter)
 {
 	var ret;
 	scope.add_new_block_scope();
diff --git a/balloon/abstract_syntax_tree.h b/balloon/abstract_syntax_tree.h
index da057b0..eb9238e 100644
--- a/balloon/abstract_syntax_tree.h
+++ b/balloon/abstract_syntax_tree.h
@@ -206,7 +206,7 @@ class abstract_syntax_tree
 		void run_root();
 		int run_loop();
 		int run_ifelse();
-		var run_func();
+		var run_func(std::list<var>);
 		int run_block();
 };
 
diff --git a/balloon/balloon.h b/balloon/balloon.h
index 24bda53..561d908 100644
--- a/balloon/balloon.h
+++ b/balloon/balloon.h
@@ -48,6 +48,5 @@ void alert_sound()
 /* global varia in abstract_syntax_tree.cpp :
 	int exit_type;                        // record the state of runtime
 	std::stack<var> ret_stack;            // for function ret use
-	std::list<var> parameter;             // for function call use
 */
 #endif
diff --git a/balloon/balloon_lexer.h b/balloon/balloon_lexer.h
index 79b124f..0733b85 100644
--- a/balloon/balloon_lexer.h
+++ b/balloon/balloon_lexer.h
@@ -88,6 +88,13 @@ class resource_file
 			resource.clear();
 			return;
 		}
+		void add_lib()
+		{
+			std::string lib_name;
+			lib_name="lib/math.nas";
+			input_file(lib_name);
+			return;
+		}
 		void input_file(std::string filename)
 		{
 			std::ifstream fin(filename,std::ios::binary);
diff --git a/balloon/lib/math.nas b/balloon/lib/math.nas
index 8cca27b..0013f20 100644
--- a/balloon/lib/math.nas
+++ b/balloon/lib/math.nas
@@ -1,12 +1,18 @@
-var fabs=func(__x)
+var abs=func(__x)
 {
-    if(x>0){return __x;}
+    if(__x>0){return __x;}
     else{return -__x;}
 };
 
-var ln=func(__x)
+var asr=func(__x,__y)
 {
-    return (1+8/(1+__x)+1/__x)*(__x-1)/6;
+    if(abs(__y-__x)<=0.1){return (1/__x+8/(__x+__y)+1/__y)*(__y-__x)/6;}
+    var __mid=(__x+__y)/2;
+    return asr(__x,__mid)+asr(__mid,__y);
+};
+var ln=func(_x)
+{
+    return asr(1,_x);
 };
 
 var log=func(__a,__x)
@@ -26,7 +32,7 @@ var pow=func(__x,__num)
 {
     if(__num==0){return 1;}
     else if(__num<0){return 1/pow(__x,-__num);}
-    else{return exp(__x*ln(__num));}
+    else{return exp(__num*ln(__x));}
 };
 
 var sigmoid=func(__x)
diff --git a/balloon/main.cpp b/balloon/main.cpp
index c497aad..9910c39 100644
--- a/balloon/main.cpp
+++ b/balloon/main.cpp
@@ -25,6 +25,7 @@ int main()
 			std::cout<<">> 7. [del   ] |delete program in memory."<<std::endl;
 			std::cout<<">> 8. [run   ] |run the programme in stack. (-lexer -parser)"<<std::endl;
 			std::cout<<">> 9. [rs    ] |check the source program."<<std::endl;
+			std::cout<<">>10. [lib   ] |add lib into resource codes."<<std::endl;
 		}
 		else if(command=="cls")
 		{
@@ -42,6 +43,8 @@ int main()
 			lex.scanner(prog.get_resource());
 			lex.print_token_list();
 		}
+		else if(command=="lib")
+			prog.add_lib();
 		else if(command=="del")
 		{
 			prog.set_clear();