diff --git a/version1.0/abstract_syntax_tree.h b/version1.0/abstract_syntax_tree.h
index bd1cd34..da9c66d 100644
--- a/version1.0/abstract_syntax_tree.h
+++ b/version1.0/abstract_syntax_tree.h
@@ -137,7 +137,7 @@ class operator_expr:public ast_tree_node
 	public:
 		operator_expr():ast_tree_node()
 		{
-			type=__operator;
+			type=__add_operator;
 		}
 		void set_operator_type(int oprt_type)
 		{
diff --git a/version1.0/ast.h b/version1.0/ast.h
index 36b51c8..53adf86 100644
--- a/version1.0/ast.h
+++ b/version1.0/ast.h
@@ -6,6 +6,7 @@ class abstract_syntax_tree
 	protected:
 		int ast_node_type;
 		std::list<abstract_syntax_tree> statement_list;
+		std::list<abstract_syntax_tree> children;
 		double var_number;
 		std::string var_string;
 	public:
@@ -13,25 +14,65 @@ class abstract_syntax_tree
 		{
 			ast_node_type=__root;
 			statement_list.clear();
+			children.clear();
 			var_number=0;
 			var_string="";
 		}
 		abstract_syntax_tree(const abstract_syntax_tree& temp)
 		{
 			ast_node_type=temp.ast_node_type;
-			statement_list=temp.statement_list;
+			if(temp.statement_list.empty())
+				statement_list.clear();
+			else
+				statement_list=temp.statement_list;
+			if(temp.children.empty())
+				children.clear();
+			else
+				children=temp.children;
 			var_number=temp.var_number;
 			var_string=temp.var_string;
 		}
+		// for statement block
+		void set_block()
+		{
+			ast_node_type=__block;
+			return;
+		}
+		void add_statement(abstract_syntax_tree statement_head)
+		{
+			statement_list.push_back(statement_head);
+			return;
+		}
+		// for sub-tree node operator
+		void set_two_operator(const int operator_type,abstract_syntax_tree f_child,abstract_syntax_tree s_child)
+		{
+			ast_node_type=operator_type;
+			children.push_back(f_child);
+			children.push_back(s_child);
+			return;
+		}
+		void set_one_operator(const int operator_type,abstract_syntax_tree f_child)
+		{
+			ast_node_type=operator_type;
+			children.push_back(f_child);
+			return;
+		}
+		// for leaf node string
 		void set_node_to_string(std::string& str)
 		{
 			ast_node_type=__string;
 			var_string=str;
 			return;
 		}
+		// for leaf node number
 		void set_node_to_number(std::string& str)
 		{
 			ast_node_type=__number;
+			if(str=="nil")
+			{
+				var_number=0;
+				return;
+			}
 			if((int)str.length()>2 && (str[1]=='x' || str[1]=='o'))
 			{
 				if(str[1]=='x')
diff --git a/version1.0/nasal_parser.h b/version1.0/nasal_parser.h
index 32378ca..84496a5 100644
--- a/version1.0/nasal_parser.h
+++ b/version1.0/nasal_parser.h
@@ -127,6 +127,7 @@ class nasal_parser
 		void mul_div_operator_expr();
 		void link_operator_expr();
 		void compare_operator_expr();
+		void one_operator_expr();
 		void check_semi_at_end();
 		void statements_block();
 		void function_generate_expr();
@@ -181,6 +182,9 @@ void nasal_parser::statements_block()
 			case __number:number_begin_expr();check_semi_at_end();break;
 			case __string:string_begin_expr();check_semi_at_end();break;
 			case __if:parse.push(this_token);if_else_expr();break;
+			case __add_operator:
+			case __sub_operator:
+			case __nor_operator:one_operator_expr();break;
 			case __while:
 			case __for:
 			case __foreach:
@@ -371,6 +375,9 @@ void nasal_parser::definition_expr()
 		case __string:string_begin_expr();break;
 		case __id:identifier_begin_expr();break;
 		case __func:function_generate_expr();break;
+		case __add_operator:
+		case __sub_operator:
+		case __nor_operator:one_operator_expr();break;
 		case __left_bracket:list_generate_expr();break;
 		case __left_brace:hash_generate_expr();break;
 		case __left_curve:in_curve_calc_expr();break;
@@ -391,6 +398,9 @@ void nasal_parser::assignment_expr()
 		case __string:string_begin_expr();break;
 		case __id:identifier_begin_expr();break;
 		case __func:function_generate_expr();break;
+		case __add_operator:
+		case __sub_operator:
+		case __nor_operator:one_operator_expr();break;
 		case __left_bracket:list_generate_expr();break;
 		case __left_brace:hash_generate_expr();break;
 		case __left_curve:in_curve_calc_expr();break;
@@ -439,6 +449,9 @@ void nasal_parser::if_else_expr()
 	get_token();
 	switch(this_token.type)
 	{
+		case __add_operator:
+		case __sub_operator:
+		case __nor_operator:one_operator_expr();break;
 		case __number:number_begin_expr();break;
 		case __string:string_begin_expr();break;
 		case __id:identifier_begin_expr();break;
@@ -457,6 +470,8 @@ void nasal_parser::if_else_expr()
 		return;
 	}
 	statements_block();
+	if(parse.empty())
+		return;
 	get_token();
 	while(this_token.type==__elsif || else_if_check())
 	{
@@ -470,6 +485,9 @@ void nasal_parser::if_else_expr()
 		get_token();
 		switch(this_token.type)
 		{
+			case __add_operator:
+			case __sub_operator:
+			case __nor_operator:one_operator_expr();break;
 			case __number:number_begin_expr();break;
 			case __string:string_begin_expr();break;
 			case __id:identifier_begin_expr();break;
@@ -487,6 +505,8 @@ void nasal_parser::if_else_expr()
 			return;
 		}
 		statements_block();
+		if(parse.empty())
+			return;
 		get_token();
 	}
 	if(this_token.type==__else)
@@ -510,6 +530,9 @@ void nasal_parser::loop_expr()
 		get_token();
 		switch(this_token.type)
 		{
+			case __add_operator:
+			case __sub_operator:
+			case __nor_operator:one_operator_expr();break;
 			case __number:number_begin_expr();break;
 			case __string:string_begin_expr();break;
 			case __id:identifier_begin_expr();break;
@@ -555,6 +578,9 @@ void nasal_parser::loop_expr()
 		get_token();
 		switch(this_token.type)
 		{
+			case __add_operator:
+			case __sub_operator:
+			case __nor_operator:one_operator_expr();break;
 			case __id:identifier_begin_expr();break;
 			case __number:number_begin_expr();break;
 			case __string:string_begin_expr();break;
@@ -718,11 +744,31 @@ void nasal_parser::compare_operator_expr()
 	}
 	return;
 }
+void nasal_parser::one_operator_expr()
+{
+	get_token();
+	switch(this_token.type)
+	{
+		case __number:number_begin_expr();break;
+		case __string:string_begin_expr();break;
+		case __id:identifier_begin_expr();break;
+		case __left_curve:in_curve_calc_expr();break;
+		default:
+			++error;
+			std::cout<<">>[Error] line "<<this_token.line<<": expect a data after this operator."<<std::endl;
+			return;
+			break;
+	}
+	return;
+}
 void nasal_parser::in_curve_calc_expr()
 {
 	get_token();
 	switch(this_token.type)
 	{
+		case __add_operator:
+		case __sub_operator:
+		case __nor_operator:one_operator_expr();break;
 		case __number:number_begin_expr();break;
 		case __string:string_begin_expr();break;
 		case __id:identifier_begin_expr();break;
@@ -980,6 +1026,9 @@ void nasal_parser::parse_main_work()
 			case __string:string_begin_expr();check_semi_at_end();break;
 			case __left_curve:in_curve_calc_expr();check_semi_at_end();break;
 			case __if:parse.push(this_token);if_else_expr();break;
+			case __add_operator:
+			case __sub_operator:
+			case __nor_operator:one_operator_expr();break;
 			case __while:
 			case __for:
 			case __foreach:
diff --git a/version1.0/nasal_token_type.h b/version1.0/nasal_token_type.h
index 35ead73..fac9839 100644
--- a/version1.0/nasal_token_type.h
+++ b/version1.0/nasal_token_type.h
@@ -29,7 +29,8 @@ enum token_type
 	__number,__string,__id,__dynamic_id,
 	//basic elements
 	
-	__root,__operator,
+	__root,
+	__block,
 	__definition,__assignment,
 	__function,__loop,__ifelse
 };
@@ -73,16 +74,16 @@ void print_token(int type)
 		case __unknown_operator:  context="unknown_operator";break;
 		case __var:               context="var"; break;
 		case __func:              context="func";break;
-		case __continue:          context="ctn"; break;
-		case __break:             context="brk"; break;
+		case __continue:          context="continye"; break;
+		case __break:             context="break"; break;
 		case __for:               context="for"; break;
-		case __forindex:          context="foridx";break;
-		case __foreach:           context="foreh";break;
+		case __forindex:          context="forindex";break;
+		case __foreach:           context="foreach";break;
 		case __while:             context="while";break;
 		case __if:                context="if";break;
 		case __elsif:             context="elsif";break;
 		case __else:              context="else";break;
-		case __return:            context="rtrn";break;
+		case __return:            context="return";break;
 		
 		case __id:                context="id";break;
 		case __dynamic_id:        context="id...";break;
@@ -90,7 +91,7 @@ void print_token(int type)
 		case __string:            context="str";break;
 		
 		case __root:              context="root";break;
-		case __operator:          context="operator";break;
+		case __block:             context="block";break;
 		case __definition:        context="definition";break;
 		case __assignment:        context="assignment";break;
 		case __function:          context="function";break;