diff --git a/version1.2/ast.h b/version1.2/ast.h
index 84fa126..09f21ef 100644
--- a/version1.2/ast.h
+++ b/version1.2/ast.h
@@ -71,6 +71,23 @@ class abstract_syntax_tree
 			}
 			return;
 		}
+		void run_tree()
+		{
+			if(!children.empty())
+			{
+				for(auto i=children.begin();i!=children.end();++i)
+				{
+					switch(i->ast_node_type)
+					{
+						case __number:std::cout<<i->var_number<<std::endl;break;
+						case __string:std::cout<<i->var_string<<std::endl;break;
+						case __id:std::cout<<i->var_name<<std::endl;break;
+						default:i->run_tree();break;
+					}
+				}
+			}
+			return;
+		}
 		void set_node_type(const int type)
 		{
 			ast_node_type=type;
@@ -164,15 +181,15 @@ class abstract_syntax_tree
 			children.push_back(p);
 			return;
 		}
-		double return_var_number()
+		double get_var_number()
 		{
 			return var_number;
 		}
-		std::string return_var_string()
+		std::string get_var_string()
 		{
 			return var_string;
 		}
-		std::string return_var_name()
+		std::string get_var_name()
 		{
 			return var_name;
 		}
diff --git a/version1.2/main.cpp b/version1.2/main.cpp
index 9fd5aa5..c1b1353 100644
--- a/version1.2/main.cpp
+++ b/version1.2/main.cpp
@@ -4,6 +4,7 @@ int main()
 	resource_programme_process prog;
 	nasal_lexer lex;
 	nasal_parser pas;
+	runtime rt;
 	std::string command;
 	std::cout<<">> Nasal interpreter by ValKmjolnir"<<std::endl;
 	std::cout<<">> Input [help] to find help."<<std::endl;
@@ -61,6 +62,8 @@ int main()
 			pas.parse_main_work();
 			if(!pas.get_error_num())
 				pas.print_generated_ast();
+			else
+				std::cout<<">>[Abstract_syntax_tree] error(s) occurred,stop."<<std::endl;
 		}
 		else if(command=="run")
 		{
@@ -69,9 +72,9 @@ int main()
 			pas.parse_process(lex.return_list());
 			pas.parse_main_work();
 			if(!pas.get_error_num())
-			{
-				;
-			}
+				rt.run_abstract_syntax_tree(pas.get_tree());
+			else
+				std::cout<<">>[Runtime] error(s) occurred,stop."<<std::endl;
 		}
 		else
 			prog.input_file(command);
diff --git a/version1.2/nasal.h b/version1.2/nasal.h
index 640ca80..c55f519 100644
--- a/version1.2/nasal.h
+++ b/version1.2/nasal.h
@@ -10,7 +10,7 @@
 
 #include "nasal_token_type.h"
 #include "ast.h"
-
+#include "nasal_runtime.h"
 #include "nasal_lexer.h"
 #include "nasal_parser.h"
 
diff --git a/version1.2/nasal_parser.h b/version1.2/nasal_parser.h
index d01b12e..c529934 100644
--- a/version1.2/nasal_parser.h
+++ b/version1.2/nasal_parser.h
@@ -31,6 +31,10 @@ class nasal_parser
 		{
 			return error;
 		}
+		abstract_syntax_tree& get_tree()
+		{
+			return root;
+		}
 		void print_generated_ast()
 		{
 			std::cout<<">>[Abstract-syntax-tree]"<<std::endl;
diff --git a/version1.2/nasal_runtime.h b/version1.2/nasal_runtime.h
new file mode 100644
index 0000000..56dfba6
--- /dev/null
+++ b/version1.2/nasal_runtime.h
@@ -0,0 +1,168 @@
+#ifndef __NASAL_RUNTIME_H__
+#define __NASAL_RUNTIME_H__
+#include "ast.h"
+
+class var
+{
+	private:
+		int type;
+		std::string name;
+		double number;
+		std::string str;
+		std::list<var> var_list;
+		std::list<var> var_hash;
+		abstract_syntax_tree function;
+	public:
+		var()
+		{
+			type=0;
+			name="";
+			number=0;
+			str="";
+			function.set_clear();
+		}
+		var(const var& p)
+		{
+			type=p.type;
+			name=p.name;
+			number=p.number;
+			str=p.str;
+			function=p.function;
+		}
+		var& operator=(const var& p)
+		{
+			type=p.type;
+			name=p.name;
+			number=p.number;
+			str=p.str;
+			function=p.function;
+			return *this;
+		}
+		void set_type(const int var_type)
+		{
+			type=var_type;
+			return;
+		}
+		void set_name(std::string& var_name_str)
+		{
+			name=var_name_str;
+			return;
+		}
+		void set_number(const double var_number)
+		{
+			number=var_number;
+			return;
+		}
+		void set_string(std::string& s)
+		{
+			str=s;
+			return;
+		}
+		void set_function(abstract_syntax_tree& func)
+		{
+			function=func;
+			return;
+		}
+		void set_list(std::list<var>& p)
+		{
+			var_list=p;
+			return;
+		}
+		void append_list(var& p)
+		{
+			var_list.push_back(p);
+			return;
+		}
+		void set_hash(std::list<var>& p)
+		{
+			var_hash=p;
+			return;
+		}
+		void append_hash(var& p)
+		{
+			var_hash.push_back(p);
+			return;
+		}
+		std::string get_name()
+		{
+			return name;
+		}
+		double get_number()
+		{
+			return number;
+		}
+		std::string get_string()
+		{
+			return str;
+		}
+		abstract_syntax_tree get_function()
+		{
+			return function;
+		}
+		std::list<var>& get_list()
+		{
+			return var_list;
+		}
+		std::list<var>& get_hash()
+		{
+			return var_hash;
+		}
+};
+
+class var_list_manager
+{
+	private:
+		std::list<var> var_list;
+	public:
+		var_list_manager()
+		{
+			var_list.clear();
+			var null_var;
+			var_list.push_back(null_var);
+			return;
+		}
+		void add_var(var& tmp)
+		{
+			for(auto i=var_list.begin();i!=var_list.end();++i)
+				if(i->get_name()==tmp.get_name())
+				{
+					std::cout<<">>[Runtime-error] redeclaration of '"<<tmp.get_name()<<"'."<<std::endl;
+					return;
+				}
+			var_list.push_back(tmp);
+			return;
+		}
+		void del_latest_var()
+		{
+			var_list.pop_back();
+			return;
+		}
+		var& search_var(std::string& str)
+		{
+			for(auto i=var_list.begin();i!=var_list.end();++i)
+				if(i->get_name()==str)
+					return *i;
+			std::cout<<">>[Runtime-error] '"<<str<<"' is not delclared in this scope."<<std::endl;
+			return *var_list.begin();
+		}
+};
+
+class runtime
+{
+	private:
+		abstract_syntax_tree root;
+	public:
+		runtime()
+		{
+			root.set_clear();
+			return;
+		}
+		void run_abstract_syntax_tree(abstract_syntax_tree& tmp_tree)
+		{
+			root.set_clear();
+			root=tmp_tree;
+			root.run_tree();
+			return;
+		}
+};
+#endif