diff --git a/nasal.h b/nasal.h
index 1ce953c..f089d18 100644
--- a/nasal.h
+++ b/nasal.h
@@ -116,6 +116,27 @@ std::string num2str(double number)
 	ss<<number;
 	return ss.str();
 }
+
+/*
+	show raw string
+*/
+void raw_string(std::string& str)
+{
+	for(auto i:str)
+		switch(i)
+		{
+			case '\a': std::cout<<"\\a";break;
+			case '\b': std::cout<<"\\b";break;
+			case '\f': std::cout<<"\\f";break;
+			case '\n': std::cout<<"\\n";break;
+			case '\r': std::cout<<"\\r";break;
+			case '\t': std::cout<<"\\t";break;
+			case '\v': std::cout<<"\\v";break;
+			case '\0': std::cout<<"\\0";break;
+			default:   std::cout<<i;    break;
+		}
+	return;
+}
 #include "nasal_lexer.h"
 #include "nasal_ast.h"
 #include "nasal_parse.h"
diff --git a/nasal_ast.h b/nasal_ast.h
index 9ca8157..6416488 100644
--- a/nasal_ast.h
+++ b/nasal_ast.h
@@ -132,7 +132,10 @@ void nasal_ast::print_ast(int depth)
         std::cout<<"|  ";
     std::cout<<ast_name[type];
     if(type==ast_str || type==ast_id || type==ast_default_arg || type==ast_dynamic_id || type==ast_callh)
-        std::cout<<":"<<str;
+    {
+        std::cout<<":";
+        raw_string(str);
+    }
     else if(type==ast_num || type==ast_file)
         std::cout<<":"<<num;
     std::cout<<'\n';
diff --git a/nasal_codegen.h b/nasal_codegen.h
index 426adcb..5411349 100644
--- a/nasal_codegen.h
+++ b/nasal_codegen.h
@@ -1236,7 +1236,11 @@ void nasal_codegen::print_op(int index)
         case op_mcallh:
         case op_para:
         case op_defpara:
-        case op_dynpara:printf(" (%s)\n",str_res_table[exec_code[index].num].c_str());break;
+        case op_dynpara:
+            printf(" (");
+            raw_string(str_res_table[exec_code[index].num]);
+            printf(")\n");
+            break;
         default:printf("\n");break;
     }
     return;
@@ -1247,7 +1251,11 @@ void nasal_codegen::print_byte_code()
     for(auto& num:num_res_table)
         std::cout<<".number "<<num<<'\n';
     for(auto& str:str_res_table)
-        std::cout<<".symbol "<<str<<'\n';
+    {
+        std::cout<<".symbol ";
+        raw_string(str);
+        std::cout<<'\n';
+    }
     for(int i=0;i<exec_code.size();++i)
         print_op(i);
     return;
diff --git a/nasal_vm.h b/nasal_vm.h
index e752ece..beccb74 100644
--- a/nasal_vm.h
+++ b/nasal_vm.h
@@ -151,19 +151,18 @@ void nasal_vm::die(std::string str)
     printf("vm stack(limit 10):\n");
     for(int i=0;i<10 && stack_top-i>=gc.val_stack;++i)
     {
-        printf("\t0x%.p ",stack_top[-i]);
         if(!stack_top[-i])
-            printf(" nullptr\n");
+            printf("\t%p nullptr\n",stack_top[-i]);
         else
             switch(stack_top[-i]->type)
             {
-                case vm_nil:  printf("nil\n");break;
-                case vm_num:  printf("num  %lf\n",stack_top[-i]->ptr.num);   break;
-                case vm_str:  printf("str  at %p\n",stack_top[-i]->ptr.str); break;
-                case vm_func: printf("func at %p\n",stack_top[-i]->ptr.func);break;
-                case vm_vec:  printf("vec  at %p\n",stack_top[-i]->ptr.vec); break;
-                case vm_hash: printf("hash at %p\n",stack_top[-i]->ptr.hash);break;
-                default:      printf("unknown\n");break;
+                case vm_nil:  printf("\t%p nil\n",stack_top[-i]);break;
+                case vm_num:  printf("\t%p num :%lf\n",stack_top[-i],stack_top[-i]->ptr.num);break;
+                case vm_str:  printf("\t%p str :",stack_top[-i]->ptr.str);raw_string(*stack_top[-i]->ptr.str);putchar('\n');break;
+                case vm_func: printf("\t%p func\n",stack_top[-i]->ptr.func);break;
+                case vm_vec:  printf("\t%p vec \n",stack_top[-i]->ptr.vec); break;
+                case vm_hash: printf("\t%p hash\n",stack_top[-i]->ptr.hash);break;
+                default:      printf("\t%p unknown\n",stack_top[-i]);break;
             }
     }
     gc.val_stack[STACK_MAX_DEPTH-1]=(nasal_val*)0xffff;