diff --git a/version3.0/main.cpp b/version3.0/main.cpp
index 9025e7e..ddd1392 100644
--- a/version3.0/main.cpp
+++ b/version3.0/main.cpp
@@ -1,5 +1,26 @@
 #include "nasal.h"
 
+nasal_resource resource;
+nasal_lexer    lexer;
+nasal_parse    parse;
+std::string    command;
+
+void help()
+{
+	std::cout<<">> [\'file\'] input a file."<<std::endl;
+	std::cout<<">> [cls   ] clear the screen."<<std::endl;
+	std::cout<<">> [del   ] clear the resource code."<<std::endl;
+	std::cout<<">> [lib   ] add lib file."<<std::endl;
+	std::cout<<">> [rs    ] print resource code."<<std::endl;
+	std::cout<<">> [lex   ] turn code into tokens."<<std::endl;
+	std::cout<<">> [par   ] turn tokens into abstract syntax tree."<<std::endl;
+	std::cout<<">> [ast   ] check the abstract syntax tree."<<std::endl;
+	std::cout<<">> [run   ] run code."<<std::endl;
+	std::cout<<">> [logo  ] print logo of nasal ."<<std::endl;
+	std::cout<<">> [exit  ] quit nasal interpreter."<<std::endl;
+	return;
+}
+
 void logo()
 {
     std::cout<<"       __                _      "<<std::endl;
@@ -10,9 +31,26 @@ void logo()
     return;
 }
 
-nasal_resource resource;
-nasal_lexer    lexer;
-std::string    command;
+void lex_func()
+{
+	lexer.scanner(resource.get_file());
+	if(!lexer.get_error()) lexer.print_token();
+	else std::cout<<">> [lexer] error occurred,stop.\n";
+	return;
+}
+
+void par_func()
+{
+	lexer.scanner(resource.get_file());
+	if(!lexer.get_error())
+	{
+		parse.set_toklist(lexer.get_token_list());
+		if(parse.get_error()) std::cout<<">> [parse] error occurred,stop.\n";
+	}
+	else std::cout<<">> [lexer] error occurred,stop.\n";
+	return;
+}
+
 int main()
 {
 #ifdef _WIN32
@@ -39,19 +77,7 @@ int main()
 		std::cout<<">> ";
 		std::cin>>command;
 		if(command=="help")
-		{
-			std::cout<<">> [\'file\'] input a file."<<std::endl;
-			std::cout<<">> [cls   ] clear the screen."<<std::endl;
-			std::cout<<">> [del   ] clear the resource code."<<std::endl;
-			std::cout<<">> [lib   ] add lib file."<<std::endl;
-			std::cout<<">> [rs    ] print resource code."<<std::endl;
-			std::cout<<">> [lex   ] turn code into tokens."<<std::endl;
-			std::cout<<">> [par   ] turn tokens into abstract syntax tree."<<std::endl;
-			std::cout<<">> [ast   ] check the abstract syntax tree."<<std::endl;
-			std::cout<<">> [run   ] run code."<<std::endl;
-			std::cout<<">> [logo  ] print logo of nasal ."<<std::endl;
-			std::cout<<">> [exit  ] quit nasal interpreter."<<std::endl;
-		}
+			help();
 		else if(command=="cls")
 		{
 #ifdef _WIN32
@@ -67,6 +93,8 @@ int main()
 		else if(command=="del")
 		{
 			resource.delete_file();
+			lexer.delete_tokens();
+			parse.clear();
 			std::cout<<">> [Delete] complete."<<std::endl;
 		}
 		else if(command=="lib")
@@ -74,17 +102,9 @@ int main()
 		else if(command=="rs")
 			resource.print_file();
 		else if(command=="lex")
-		{
-			lexer.scanner(resource.get_file());
-			if(!lexer.get_error())
-				lexer.print_token();
-			else
-				std::cout<<">> [lexer] error occurred,stop.\n";
-		}
+			lex_func();
 		else if(command=="par")
-		{
-			;
-		}
+			par_func();
 		else if(command=="ast")
 		{
 			;
diff --git a/version3.0/nasal.ebnf b/version3.0/nasal.ebnf
new file mode 100644
index 0000000..7de9ee0
--- /dev/null
+++ b/version3.0/nasal.ebnf
@@ -0,0 +1,118 @@
+(*
+ <>  must choose
+ []  can choose
+ {}  can repeat 0 to infinite time(s)
+ |   or
+ ::= is defined as
+*)
+
+nil   ::= nil;
+id    ::= identifier;
+number::= number;
+string::= string;
+vector::= 
+    '[' {calculation ','} ']'
+;
+hash  ::=
+    '{' {hashmember ','} '}'
+;
+hashmember::=
+    id ':' calculation
+;
+function::= 
+    func argument_list expressions
+;
+argument_list::=
+    '(' [{id ','} ([id '...']|{id '=' calculation ','})] ')'
+;
+expressions::=
+    '{' {definition|assignment|calculation|loop|conditional} '}'
+    |definition ';'
+    |multi_assignment ';'
+    |calculation ';'
+    |loop
+    |conditional
+;
+calculation::=
+    '(' calculation ')'
+    |scalar_gen
+    |trinocular
+    |and_expr
+    |calculation ('=' | '+=' | '-=' | '*=' | '/=' | '~=') calculation
+;
+trinocular::=
+    calculation '?' calculation ':' calculation
+;
+and_expr::=
+    or_expr and or_expr
+;
+or_expr::=
+    cmp_expr or cmp_expr
+;
+cmp_expr::=
+    additive_expr ('==' | '!=' | '>' | '<' | '>=' | '<=') additive_expr
+;
+additive_expr::=
+    multive_expr ('+' | '-' | '~') multive_expr
+;
+multive_expr::=
+    unary ('*' | '/') unary
+;
+unary::=
+    ('-'|'!') calculation
+;
+scalar_gen::=
+    function_call
+    |identifier_call
+    |vector_call
+    |hash_call
+    |number
+    |string
+;
+function_call::=
+    function {call_scalar}
+;
+identifier_call::=
+    id {call_scalar}
+;
+vector_call::=
+    vector {call_scalar}
+;
+hash_call::=
+    hash {call_scalar}
+;
+call_scalar::=
+    '.' id
+    |'[' {(calculation | subvec) ','} ']'
+    |'(' {calculation ','} ')'
+    |'(' {hashmember ','} ')'
+;
+subvec::=
+    calculation ':' calculation
+    |calculation ':'
+    |':' calculation
+;
+definition::=
+    var id '=' calculation
+    |var '(' multi_id ')' '=' (calculation | multi_scalar)
+    |'(' var multi_id ')' '=' (calculation | multi_scalar)
+;
+multi_id::=
+    {id ','} <id>
+;
+multi_scalar::=
+    '(' {calculation ','} <calculation> ')'
+;
+multi_assignment::=
+    multi_scalar '=' multi_scalar
+;
+loop::=
+    while '(' calculation ')' expressions
+    |for '(' [definition] ';' [calculation] ';' [calculation] ')' expressions
+    |(forindex | foreach) '(' (definition | assignment) ';' calculation ')' expressions
+;
+conditional::=
+    if '(' calculation ')' expressions
+    {elsif '(' calculation ')' expressions}
+    [else expressions]
+;
\ No newline at end of file
diff --git a/version3.0/nasal.h b/version3.0/nasal.h
index 69e817b..1fb3418 100644
--- a/version3.0/nasal.h
+++ b/version3.0/nasal.h
@@ -19,6 +19,7 @@
 #include "nasal_misc.h"
 #include "nasal_resource.h"
 #include "nasal_lexer.h"
+#include "nasal_ast.h"
 #include "nasal_parse.h"
 
 #endif
\ No newline at end of file
diff --git a/version3.0/nasal_ast.h b/version3.0/nasal_ast.h
new file mode 100644
index 0000000..c5c5ff6
--- /dev/null
+++ b/version3.0/nasal_ast.h
@@ -0,0 +1,103 @@
+#ifndef __NASAL_AST_H__
+#define __NASAL_AST_H__
+
+class nasal_ast
+{
+private:
+    int line;
+    int type;
+    std::string str;
+    std::vector<nasal_ast> children;
+public:
+    nasal_ast();
+    nasal_ast(const nasal_ast&);
+    ~nasal_ast();
+    void clear();
+    void set_line(int);
+    void set_type(int);
+    void set_str(std::string&);
+    void add_child(nasal_ast&);
+    int  get_line();
+    int  get_type();
+    std::string get_str();
+    std::vector<nasal_ast>& get_children();
+};
+
+nasal_ast::nasal_ast()
+{
+    this->line=0;
+    this->type=ast_null;
+    this->str="";
+    return;
+}
+
+nasal_ast::nasal_ast(const nasal_ast& tmp)
+{
+    this->line=tmp.line;
+    this->type=tmp.type;
+    this->str=tmp.str;
+    this->children=tmp.children;
+    return;
+}
+
+nasal_ast::~nasal_ast()
+{
+    this->str.clear();
+    this->children.clear();
+    return;
+}
+
+void nasal_ast::clear()
+{
+    this->line=0;
+    this->type=ast_null;
+    this->str="";
+    this->children.clear();
+    return;
+}
+
+void nasal_ast::set_line(int l)
+{
+    this->line=l;
+    return;
+}
+
+void nasal_ast::set_type(int t)
+{
+    this->type=t;
+    return;
+}
+
+void nasal_ast::set_str(std::string& s)
+{
+    this->str=s;
+    return;
+}
+
+void nasal_ast::add_child(nasal_ast& ast)
+{
+    children.push_back(ast);
+    return;
+}
+
+int nasal_ast::get_line()
+{
+    return this->line;
+}
+
+int nasal_ast::get_type()
+{
+    return this->type;
+}
+
+std::string nasal_ast::get_str()
+{
+    return this->str;
+}
+
+std::vector<nasal_ast>& nasal_ast::get_children()
+{
+    return this->children;
+}
+
+#endif
\ No newline at end of file
diff --git a/version3.0/nasal_enum.h b/version3.0/nasal_enum.h
index b7ed275..513d7f1 100644
--- a/version3.0/nasal_enum.h
+++ b/version3.0/nasal_enum.h
@@ -18,4 +18,12 @@ enum token_type
     tok_cmp_equal,tok_cmp_not_equal,tok_less_than,tok_greater_than,tok_less_equal,tok_greater_equal
 };
 
+enum ast_node
+{
+    ast_null=0,
+    ast_nil,ast_number,ast_string,ast_identifier,
+    ast_for,ast_forindex,ast_foreach,ast_while,
+    ast_definition,ast_assignment
+};
+
 #endif
\ No newline at end of file
diff --git a/version3.0/nasal_lexer.h b/version3.0/nasal_lexer.h
index 889b9f3..f74b3f6 100644
--- a/version3.0/nasal_lexer.h
+++ b/version3.0/nasal_lexer.h
@@ -81,14 +81,15 @@ class nasal_lexer
 private:
     int error;
     std::vector<token> token_list;
-public:
-    std::string identifier_gen(std::vector<char>&,int&,int&);
+	std::string identifier_gen(std::vector<char>&,int&,int&);
     std::string number_gen(std::vector<char>&,int&,int&);
     std::string string_gen(std::vector<char>&,int&,int&);
+public:
     void delete_tokens();
     void scanner(std::vector<char>&);
     void print_token();
     int  get_error();
+	std::vector<token>& get_token_list();
 };
 
 void nasal_lexer::delete_tokens()
@@ -323,4 +324,9 @@ int nasal_lexer::get_error()
 {
     return error;
 }
+
+std::vector<token>& nasal_lexer::get_token_list()
+{
+	return token_list;
+}
 #endif
\ No newline at end of file
diff --git a/version3.0/nasal_parse.h b/version3.0/nasal_parse.h
index c722b55..31b3d96 100644
--- a/version3.0/nasal_parse.h
+++ b/version3.0/nasal_parse.h
@@ -1,4 +1,127 @@
 #ifndef __NASAL_PARSE_H__
 #define __NAsAL_PARSE_H__
 
+class nasal_parse
+{
+private:
+    int tok_list_size;
+    int ptr;
+    int error;
+    nasal_ast root;
+    std::vector<token> tok_list;
+    void reset();
+    nasal_ast nil_gen();
+    nasal_ast number_gen();
+    nasal_ast string_gen();
+    nasal_ast id_gen();
+    nasal_ast vector_gen();
+    nasal_ast hash_gen();
+    nasal_ast hash_member_gen();
+    nasal_ast func_gen();
+    nasal_ast args_list_gen();
+    nasal_ast exprs_gen();
+    nasal_ast calculation();
+    nasal_ast trinocular();
+    nasal_ast and_expr();
+    nasal_ast or_expr();
+    nasal_ast cmp_expr();
+    nasal_ast additive_expr();
+    nasal_ast multive_expr();
+    nasal_ast unary();
+    nasal_ast scalar_gen();
+    nasal_ast func_call();
+    nasal_ast id_call();
+    nasal_ast vector_call();
+    nasal_ast hash_call();
+    nasal_ast call_scalar();
+    nasal_ast subvec();
+    nasal_ast definition();
+    nasal_ast multi_id();
+    nasal_ast multi_scalar();
+    nasal_ast multi_assgin();
+    nasal_ast loop();
+    nasal_ast conditional();
+public:
+    int get_error();
+    void clear();
+    void set_toklist(std::vector<token>&);
+    void main_process();
+};
+
+int nasal_parse::get_error()
+{
+    return this->error;
+}
+
+void nasal_parse::clear()
+{
+    this->tok_list_size=0;
+    this->ptr=0;
+    this->error=0;
+    this->tok_list.clear();
+    this->root.clear();
+    return;
+}
+
+void nasal_parse::set_toklist(std::vector<token>& lex_token)
+{
+    this->tok_list=lex_token;
+    tok_list_size=this->tok_list.size();
+    return;
+}
+
+void nasal_parse::main_process()
+{
+    this->reset();
+    while(ptr<tok_list_size)
+    {
+        if(tok_list[ptr].type);
+        ++ptr;
+    }
+    return;
+}
+
+void nasal_parse::reset()
+{
+    this->ptr=0;
+    this->error=0;
+    this->root.clear();
+    return;
+}
+
+nasal_ast nasal_parse::nil_gen()
+{
+    nasal_ast node;
+    node.set_line(tok_list[ptr].line);
+    node.set_type(ast_nil);
+    return node;
+}
+
+nasal_ast nasal_parse::number_gen()
+{
+    nasal_ast node;
+    node.set_line(tok_list[ptr].line);
+    node.set_type(ast_number);
+    node.set_str(tok_list[ptr].str);
+    return node;
+}
+
+nasal_ast nasal_parse::string_gen()
+{
+    nasal_ast node;
+    node.set_line(tok_list[ptr].line);
+    node.set_type(ast_string);
+    node.set_str(tok_list[ptr].str);
+    return node;
+}
+
+nasal_ast nasal_parse::id_gen()
+{
+    nasal_ast node;
+    node.set_line(tok_list[ptr].line);
+    node.set_type(ast_identifier);
+    node.set_str(tok_list[ptr].str);
+    return node;
+}
+
 #endif
\ No newline at end of file