diff --git a/version3.0/nasal_builtin.h b/version3.0/nasal_builtin.h
index e5e1030..a5d1bcf 100644
--- a/version3.0/nasal_builtin.h
+++ b/version3.0/nasal_builtin.h
@@ -5,7 +5,7 @@ int nasal_runtime::builtin_print(int local_scope_addr)
 {
     int vector_value_addr=-1;
     if(local_scope_addr>=0)
-        vector_value_addr=nasal_vm.gc_get(local_scope_addr).get_closure().get_value_address("dyn");
+        vector_value_addr=nasal_vm.gc_get(local_scope_addr).get_closure().get_value_address("elements");
     if(vector_value_addr<0 || nasal_vm.gc_get(vector_value_addr).get_type()!=vm_vector)
     {
         std::cout<<">> [runtime] builtin_print: cannot find values or wrong value type."<<std::endl;
@@ -34,5 +34,102 @@ int nasal_runtime::builtin_print(int local_scope_addr)
     nasal_vm.gc_get(ret_addr).set_type(vm_nil);
     return ret_addr;
 }
+int nasal_runtime::builtin_append(int local_scope_addr)
+{
+    int vector_value_addr=-1;
+    if(local_scope_addr>=0)
+        vector_value_addr=nasal_vm.gc_get(local_scope_addr).get_closure().get_value_address("vector");
+    if(vector_value_addr<0 || nasal_vm.gc_get(vector_value_addr).get_type()!=vm_vector)
+    {
+        std::cout<<">> [runtime] builtin_append: cannot find values or wrong value type."<<std::endl;
+        ++error;
+        return -1;
+    }
+    int elem_value_addr=-1;
+    if(local_scope_addr>=0)
+        elem_value_addr=nasal_vm.gc_get(local_scope_addr).get_closure().get_value_address("elements");
+    if(elem_value_addr<0 || nasal_vm.gc_get(elem_value_addr).get_type()!=vm_vector)
+    {
+        std::cout<<">> [runtime] builtin_append: cannot find values or wrong value type."<<std::endl;
+        ++error;
+        return -1;
+    }
+    nasal_vector& ref_vector=nasal_vm.gc_get(vector_value_addr).get_vector();
+    nasal_vector& ref_elements=nasal_vm.gc_get(elem_value_addr).get_vector();
+    int size=ref_elements.size();
+    for(int i=0;i<size;++i)
+    {
+        int value_address=ref_elements.get_value_address(i);
+        nasal_vm.add_reference(value_address);
+        ref_vector.add_elem(value_address);
+    }
+    int ret_addr=nasal_vm.gc_alloc();
+    nasal_vm.gc_get(ret_addr).set_type(vm_nil);
+    return ret_addr;
+}
+int nasal_runtime::builtin_setsize(int local_scope_addr)
+{
+    int vector_value_addr=-1;
+    if(local_scope_addr>=0)
+        vector_value_addr=nasal_vm.gc_get(local_scope_addr).get_closure().get_value_address("vector");
+    if(vector_value_addr<0 || nasal_vm.gc_get(vector_value_addr).get_type()!=vm_vector)
+    {
+        std::cout<<">> [runtime] builtin_setsize: cannot find values or wrong value type."<<std::endl;
+        ++error;
+        return -1;
+    }
+    int size_value_addr=-1;
+    if(local_scope_addr>=0)
+        size_value_addr=nasal_vm.gc_get(local_scope_addr).get_closure().get_value_address("size");
+    if(size_value_addr<0)
+    {
+        std::cout<<">> [runtime] builtin_setsize: cannot find values or wrong value type."<<std::endl;
+        ++error;
+        return -1;
+    }
+    int type=nasal_vm.gc_get(size_value_addr).get_type();
+    if(type!=vm_number && type!=vm_string)
+    {
+        std::cout<<">> [runtime] builtin_setsize: size is not a number."<<std::endl;
+        ++error;
+        return -1;
+    }
+    int number;
+    if(type==vm_number)
+        number=(int)nasal_vm.gc_get(size_value_addr).get_number();
+    else
+    {
+        std::string str=nasal_vm.gc_get(size_value_addr).get_string();
+        if(check_numerable_string(str))
+            number=(int)trans_string_to_number(str);
+        else
+        {
+            std::cout<<">> [runtime] builtin_setsize: size is not a numerable string."<<std::endl;
+            ++error;
+            return -1;
+        }
+    }
+    if(number<0)
+    {
+        std::cout<<">> [runtime] builtin_setsize: size must be greater than -1."<<std::endl;
+        ++error;
+        return -1;
+    }
+    nasal_vector& ref_vector=nasal_vm.gc_get(vector_value_addr).get_vector();
+    int vec_size=ref_vector.size();
+    if(number<vec_size)
+        for(int i=number;i<vec_size;++i)
+            ref_vector.del_elem(number);
+    else if(number>vec_size)
+        for(int i=vec_size;i<number;++i)
+        {
+            int new_val_addr=nasal_vm.gc_alloc();
+            nasal_vm.gc_get(new_val_addr).set_type(vm_nil);
+            ref_vector.add_elem(new_val_addr);
+        }
+    int ret_addr=nasal_vm.gc_alloc();
+    nasal_vm.gc_get(ret_addr).set_type(vm_nil);
+    return ret_addr;
+}
 
 #endif
\ No newline at end of file
diff --git a/version3.0/nasal_gc.h b/version3.0/nasal_gc.h
index f19ec67..a663b66 100644
--- a/version3.0/nasal_gc.h
+++ b/version3.0/nasal_gc.h
@@ -181,8 +181,10 @@ nasal_vector::~nasal_vector()
     elems.clear();
     return;
 }
-void nasal_vector::add_elem(int memory_address)
+void nasal_vector::add_elem(int value_address)
 {
+    int memory_address=nasal_vm.mem_alloc();
+    nasal_vm.mem_init(memory_address,value_address);
     elems.push_back(memory_address);
     return;
 }
@@ -253,10 +255,14 @@ nasal_hash::~nasal_hash()
     elems.clear();
     return;
 }
-void nasal_hash::add_elem(std::string key,int memory_address)
+void nasal_hash::add_elem(std::string key,int value_address)
 {
     if(elems.find(key)==elems.end())
+    {
+        int memory_address=nasal_vm.mem_alloc();
+        nasal_vm.mem_init(memory_address,value_address);
         elems[key]=memory_address;
+    }
     else
         std::cout<<">> [vm] nasal_hash::add_elem: "<<key<<" already exists."<<std::endl;
     return;
diff --git a/version3.0/nasal_runtime.h b/version3.0/nasal_runtime.h
index 8f3ab2d..ba65ec4 100644
--- a/version3.0/nasal_runtime.h
+++ b/version3.0/nasal_runtime.h
@@ -75,6 +75,8 @@ private:
 
     // builtin_func defined here
     int builtin_print(int);
+    int builtin_append(int);
+    int builtin_setsize(int);
 public:
     nasal_runtime();
     ~nasal_runtime();
@@ -145,11 +147,7 @@ int nasal_runtime::vector_generation(nasal_ast& node,int local_scope_addr)
 
     int node_children_size=node.get_children().size();
     for(int i=0;i<node_children_size;++i)
-    {
-        int new_memory_space=nasal_vm.mem_alloc();
-        ref_of_this_vector.add_elem(new_memory_space);
-        nasal_vm.mem_init(new_memory_space,calculation(node.get_children()[i],local_scope_addr));
-    }
+        ref_of_this_vector.add_elem(calculation(node.get_children()[i],local_scope_addr));
     return new_addr;
 }
 int nasal_runtime::hash_generation(nasal_ast& node,int local_scope_addr)
@@ -157,15 +155,12 @@ int nasal_runtime::hash_generation(nasal_ast& node,int local_scope_addr)
     int new_addr=nasal_vm.gc_alloc();
     nasal_vm.gc_get(new_addr).set_type(vm_hash);
     nasal_hash& ref_of_this_hash=nasal_vm.gc_get(new_addr).get_hash();
-
     int node_children_size=node.get_children().size();
     for(int i=0;i<node_children_size;++i)
     {
-        int new_memory_space=nasal_vm.mem_alloc();
-        std::string hash_member_name=node.get_children()[i].get_children()[0].get_str();
-        ref_of_this_hash.add_elem(hash_member_name,new_memory_space);
         nasal_ast& ref_of_hash_member_value=node.get_children()[i].get_children()[1];
-        nasal_vm.mem_init(new_memory_space,calculation(ref_of_hash_member_value,local_scope_addr));
+        std::string hash_member_name=node.get_children()[i].get_children()[0].get_str();
+        ref_of_this_hash.add_elem(hash_member_name,calculation(ref_of_hash_member_value,local_scope_addr));
     }
     return new_addr;
 }
@@ -204,10 +199,10 @@ int nasal_runtime::main_progress()
             case ast_conditional:ret_state=conditional_progress(root.get_children()[i],-1,false);break;
             case ast_while:case ast_for:case ast_forindex:case ast_foreach:
                 ret_state=loop_progress(root.get_children()[i],-1,false);break;
-            case ast_number:case ast_string:case ast_function:break;
+            case ast_nil:case ast_number:case ast_string:case ast_function:break;
             case ast_vector:case ast_hash:
             case ast_call:
-            case ast_add_equal:case ast_sub_equal:case ast_mult_equal:case ast_div_equal:case ast_link_equal:
+            case ast_equal:case ast_add_equal:case ast_sub_equal:case ast_mult_equal:case ast_div_equal:case ast_link_equal:
             case ast_unary_sub:case ast_unary_not:
             case ast_add:case ast_sub:case ast_mult:case ast_div:case ast_link:
             case ast_trinocular:nasal_vm.del_reference(calculation(root.get_children()[i],-1));break;
@@ -258,10 +253,10 @@ int nasal_runtime::block_progress(nasal_ast& node,int local_scope_addr,bool allo
             case ast_conditional:ret_state=conditional_progress(tmp_node,local_scope_addr,allow_return);break;
             case ast_while:case ast_for:case ast_forindex:case ast_foreach:
                 ret_state=loop_progress(tmp_node,local_scope_addr,allow_return);break;
-            case ast_number:case ast_string:case ast_function:break;
+            case ast_nil:case ast_number:case ast_string:case ast_function:break;
             case ast_vector:case ast_hash:
             case ast_call:
-            case ast_add_equal:case ast_sub_equal:case ast_mult_equal:case ast_div_equal:case ast_link_equal:
+            case ast_equal:case ast_add_equal:case ast_sub_equal:case ast_mult_equal:case ast_div_equal:case ast_link_equal:
             case ast_unary_sub:case ast_unary_not:
             case ast_add:case ast_sub:case ast_mult:case ast_div:case ast_link:
             case ast_trinocular:nasal_vm.del_reference(calculation(tmp_node,local_scope_addr));break;
@@ -306,10 +301,10 @@ int nasal_runtime::before_for_loop(nasal_ast& node,int local_scope_addr)
         case ast_null:break;
         case ast_definition:definition(node,local_scope_addr);break;
         case ast_multi_assign:multi_assignment(node,local_scope_addr);break;
-        case ast_number:case ast_string:case ast_function:break;
+        case ast_nil:case ast_number:case ast_string:case ast_function:break;
         case ast_vector:case ast_hash:
         case ast_call:
-        case ast_add_equal:case ast_sub_equal:case ast_mult_equal:case ast_div_equal:case ast_link_equal:
+        case ast_equal:case ast_add_equal:case ast_sub_equal:case ast_mult_equal:case ast_div_equal:case ast_link_equal:
         case ast_unary_sub:case ast_unary_not:
         case ast_add:case ast_sub:case ast_mult:case ast_div:case ast_link:
         case ast_trinocular:nasal_vm.del_reference(calculation(node,local_scope_addr));break;
@@ -327,10 +322,10 @@ int nasal_runtime::after_each_for_loop(nasal_ast& node,int local_scope_addr)
         case ast_null:break;
         case ast_definition:definition(node,local_scope_addr);break;
         case ast_multi_assign:multi_assignment(node,local_scope_addr);break;
-        case ast_number:case ast_string:case ast_function:break;
+        case ast_nil:case ast_number:case ast_string:case ast_function:break;
         case ast_vector:case ast_hash:
         case ast_call:
-        case ast_add_equal:case ast_sub_equal:case ast_mult_equal:case ast_div_equal:case ast_link_equal:
+        case ast_equal:case ast_add_equal:case ast_sub_equal:case ast_mult_equal:case ast_div_equal:case ast_link_equal:
         case ast_unary_sub:case ast_unary_not:
         case ast_add:case ast_sub:case ast_mult:case ast_div:case ast_link:
         case ast_trinocular:nasal_vm.del_reference(calculation(node,local_scope_addr));break;
@@ -760,17 +755,13 @@ int nasal_runtime::call_vector(nasal_ast& node,int base_value_addr,int local_sco
                 if(value_type==vm_vector || value_type==vm_hash)
                 {
                     nasal_vm.add_reference(value_addr);
-                    int new_mem_addr=nasal_vm.mem_alloc();
-                    nasal_vm.mem_init(new_mem_addr,value_addr);
-                    return_vector.add_elem(new_mem_addr);
+                    return_vector.add_elem(value_addr);
                 }
                 else
                 {
                     int tmp_value_addr=nasal_vm.gc_alloc();
                     nasal_vm.gc_get(tmp_value_addr).deepcopy(nasal_vm.gc_get(value_addr));
-                    int new_mem_addr=nasal_vm.mem_alloc();
-                    nasal_vm.mem_init(new_mem_addr,tmp_value_addr);
-                    return_vector.add_elem(new_mem_addr);
+                    return_vector.add_elem(tmp_value_addr);
                 }
             }
         }
@@ -1030,11 +1021,7 @@ int nasal_runtime::call_function(nasal_ast& node,std::string func_name,int base_
                     nasal_vm.gc_get(vector_value_addr).set_type(vm_vector);
                     nasal_vector& ref_vec=nasal_vm.gc_get(vector_value_addr).get_vector();
                     for(int j=i;j<size;++j)
-                    {
-                        int new_mem=nasal_vm.mem_alloc();
-                        nasal_vm.mem_init(new_mem,args[j]);
-                        ref_vec.add_elem(new_mem);
-                    }
+                        ref_vec.add_elem(args[j]);
                     run_closure.add_new_value(tmp_node.get_str(),vector_value_addr);
                     break;
                 }
@@ -1101,8 +1088,8 @@ int nasal_runtime::call_builtin_function(nasal_ast& node,int local_scope_addr)
     switch(builtin_num)
     {
         case 0:ret_value_addr=builtin_print(local_scope_addr);break;
-        case 1:break;
-        case 2:break;
+        case 1:ret_value_addr=builtin_append(local_scope_addr);break;
+        case 2:ret_value_addr=builtin_setsize(local_scope_addr);break;
     }
     return ret_value_addr;
 }
@@ -1413,8 +1400,6 @@ int nasal_runtime::calculation(nasal_ast& node,int local_scope_addr)
     {
         int scalar_mem_space=call_scalar_mem(node.get_children()[0],local_scope_addr);
         int new_scalar_gc_addr=calculation(node.get_children()[1],local_scope_addr);
-
-        int type=nasal_vm.gc_get(new_scalar_gc_addr).get_type();
         nasal_vm.mem_change(scalar_mem_space,new_scalar_gc_addr);// this progress will delete the reference to old gc_addr in scalar_mem_space
         nasal_vm.add_reference(new_scalar_gc_addr);// this reference is reserved for ret_address
         ret_address=new_scalar_gc_addr;