diff --git a/version2.0/abstract_syntax_tree.h b/version2.0/abstract_syntax_tree.h
index 7867cd1..9e7b634 100644
--- a/version2.0/abstract_syntax_tree.h
+++ b/version2.0/abstract_syntax_tree.h
@@ -79,6 +79,13 @@ abstract_syntax_tree::abstract_syntax_tree(const abstract_syntax_tree& tmp)
 
 abstract_syntax_tree::~abstract_syntax_tree()
 {
+	node_type=__null_type;
+	line=0;
+	symbol_number=-1;
+	symbol_is_global=false;
+	var_number=0;
+	var_string.clear();
+	var_name.clear();
 	children.clear();
 	return;
 }
@@ -117,10 +124,10 @@ void abstract_syntax_tree::print_tree_block(const int n)
 		case __string: std::cout<<": "<<var_string;break;
 		case __id:
 		case __dynamic_id:
+		case __call_hash:
 			std::cout<<": "<<var_name<<" (sym_num:"<<symbol_number<<"["<<(symbol_is_global? "global":"local")<<"])";
 			break;
 		case __call_vector:
-		case __call_hash:
 		case __call_function:break;
 		default:break;
 	}
diff --git a/version2.0/main.cpp b/version2.0/main.cpp
index ccb8f23..f651301 100644
--- a/version2.0/main.cpp
+++ b/version2.0/main.cpp
@@ -31,6 +31,7 @@ int main()
 		std::cin>>command;
 		if(command=="help")
 		{
+			std::cout<<">> be careful that this program does not support unicode(unicode will be set to \'?\')"<<std::endl;
 			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;
diff --git a/version2.0/nasal_lexer.h b/version2.0/nasal_lexer.h
index d67adef..dcc31ca 100644
--- a/version2.0/nasal_lexer.h
+++ b/version2.0/nasal_lexer.h
@@ -178,6 +178,48 @@ class nasal_lexer
 		std::list<token> token_list;
 		std::list<token> detail_token_list;
 		int error;
+		std::string utf8_clear(std::string tmp)
+		{
+			/*
+			0xxx xxxx 0x0  1 byte
+			110x xxxx 0xc0 2 byte
+			1110 xxxx 0xe0 3 byte
+			1111 0xxx 0xf0 4 byte
+			1111 10xx 0xf8 5 byte
+			1111 110x 0xfc 6 byte
+			bytes after it is:
+			10xx xxxx 0x80
+			
+			so utf-8 format is:
+			0xxxxxxx
+			110xxxxx 10xxxxxx
+			1110xxxx 10xxxxxx 10xxxxxx
+			11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+			111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
+			1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
+			*/
+			unsigned char utf8head[6]={0x0,0xc0,0xe0,0xf0,0xf8,0xfc};
+			std::string ret="";
+			for(int i=0;i<tmp.length();++i)
+			{
+				if(tmp[i]>=0)
+					ret+=tmp[i];
+				else
+				{
+					int utf8byte=0;
+					for(int j=5;j>=0;--j)
+						if((tmp[i] & utf8head[j])==utf8head[j])
+						{
+							utf8byte=j;
+							break;
+						}
+					for(int j=0;j<utf8byte;++j)
+						++i;
+					ret+='?';
+				}
+			}
+			return ret;
+		}
 	public:
 		/*
 		nasal_lexer();
@@ -350,7 +392,7 @@ class nasal_lexer
 						token new_token;
 						new_token.line=line;
 						new_token.type=__token_string;
-						new_token.str=token_str;
+						new_token.str=utf8_clear(token_str);
 						token_list.push_back(new_token);
 					}
 					++ptr;
diff --git a/version2.0/nasal_symbol_table.h b/version2.0/nasal_symbol_table.h
index a30611e..3c5647a 100644
--- a/version2.0/nasal_symbol_table.h
+++ b/version2.0/nasal_symbol_table.h
@@ -321,7 +321,7 @@ void nasal_symbol_table::symbol_table_block_generate(abstract_syntax_tree& node)
                 this->symbol_table_block_generate(*i);
         }
     }
-    else if(node_type==__id)
+    else if((node_type==__id) || (node_type==__call_hash))
     {
         symbol_table_unit tmp;
         tmp.symbol_line=node.get_node_line();