diff --git a/parts/header_file/files/elc/_files/numerical_representation/to_string/_body.hpp b/parts/header_file/files/elc/_files/numerical_representation/to_string/_body.hpp
index eac40f5d..22faeb24 100644
--- a/parts/header_file/files/elc/_files/numerical_representation/to_string/_body.hpp
+++ b/parts/header_file/files/elc/_files/numerical_representation/to_string/_body.hpp
@@ -157,9 +157,10 @@ namespace to_string_n{
 				aret.pre_alloc_before_begin(info_threshold);
 			}
 			if constexpr(is_big_type<T>){
-				//大整数类型可以通过分治法来提高效率
-				constexpr auto partition_method_threshold=max(type_info<size_t>);
-				if(num > partition_method_threshold){
+				if(num.is_safe_convert_to<size_t>())
+					return to_string(num.convert_to<size_t>());
+				else{
+					//大整数类型可以通过分治法来提高效率
 					T base{radix};
 					size_t len=1;//余数部分要补的前导0个数
 					//计算分割点
@@ -168,11 +169,9 @@ namespace to_string_n{
 						base *= base;
 					}
 					//算出分割后的高位和低位
-					auto [high,low] = divmod(num, base);
+					auto [high,low] = divmod(move(num),move(base));
 					return to_string(move(high)) + to_string(move(low)).pad_left(_repres.get_char(0), len);
 				}
-				else
-					return to_string(num.convert_to<size_t>());
 			}
 			else{
 				push_and_disable_msvc_warning(4244);
diff --git a/parts/header_file/files/elc/_files/string/string_data_t/end_apply_string_data_t.hpp b/parts/header_file/files/elc/_files/string/string_data_t/end_apply_string_data_t.hpp
index b5748c56..b52d21c5 100644
--- a/parts/header_file/files/elc/_files/string/string_data_t/end_apply_string_data_t.hpp
+++ b/parts/header_file/files/elc/_files/string/string_data_t/end_apply_string_data_t.hpp
@@ -90,18 +90,11 @@ struct end_apply_string_data_t final:base_string_data_t<char_T>,instance_struct<
 		while(type_info<this_t> == typeid(*_to) && _to->is_unique()){
 			//合并重复的end_apply_string_data_t以防树状结构过深
 			const auto p=down_cast<this_t*>(_to.get());
-			const auto p_begin=(const char_T*)(p->_m.begin());
-			const auto p_size=p->_used_size;
-			if(_m.size()-_used_size>=p_size)
-				copy_assign[p_size](note::from<const char_T*>(p_begin),note::to<char_T*>(_m.data()+_used_size));
-			else{
-				const auto size_now=this->get_size();
-				const auto size_new=get_next_gold_size_to_resize_for_array(size_now);
-				_m.insert_with_resize(_used_size,p_size,p_begin,size_new);
-			}
+			discard=p->apply_str_to_end(string_view_t(_m.begin(),_used_size));
+			_used_size=p->_used_size;
 			_to_size=p->_to_size;
-			_used_size+=p_size;
-			_to=p->_to;
+			_m=move(p->_m);
+			_to=move(p->_to);
 		}
 	}
 	void self_changed()noexcept{
diff --git a/parts/header_file/files/elc/_files/string/string_data_t/head_apply_string_data_t.hpp b/parts/header_file/files/elc/_files/string/string_data_t/head_apply_string_data_t.hpp
index ecb45dd7..1e179f8b 100644
--- a/parts/header_file/files/elc/_files/string/string_data_t/head_apply_string_data_t.hpp
+++ b/parts/header_file/files/elc/_files/string/string_data_t/head_apply_string_data_t.hpp
@@ -75,20 +75,11 @@ struct head_apply_string_data_t final:base_string_data_t<char_T>,instance_struct
 		while(type_info<this_t> == typeid(*_to) && _to->is_unique()){
 			//合并重复的head_apply_string_data_t以防树状结构过深
 			const auto p=down_cast<this_t*>(_to.get());
-			const auto p_size=p->_used_size;
-			const auto p_begin=(const char_T*)(p->_m.end())-p_size;
-			const auto this_begin=_m.end()-_used_size;
-			const auto pos=_m.size()-_used_size;
-			if(pos>=p_size)
-				copy_assign[p_size](note::from<const char_T*>(p_begin),note::to<char_T*>(this_begin-p_size));
-			else{
-				const auto size_now=this->get_size();
-				const auto size_new=get_next_gold_size_to_resize_for_array(size_now);
-				_m.insert_with_forward_resize(pos,p_size,p_begin,size_new);
-			}
+			discard=p->apply_str_to_begin(string_view_t{(char_T*)_m.end()-_used_size,_used_size});
+			_used_size=p->_used_size;
 			_to_size=p->_to_size;
-			_used_size+=p_size;
-			_to=p->_to;
+			_m=move(p->_m);
+			_to=move(p->_to);
 		}
 	}
 	void self_changed()noexcept{