diff --git a/errorcode.cpp b/errorcode.cpp
new file mode 100644
index 0000000..30b567b
--- /dev/null
+++ b/errorcode.cpp
@@ -0,0 +1,77 @@
+#include "errorcode.hpp"
+
+#define ERR2STR(code) \
+  case code:          \
+    return #code;
+namespace iflytop {
+namespace err {
+const char* error2str(int32_t code) {
+  switch (code) {
+    ERR2STR(ksucc);
+    ERR2STR(kfail);
+    ERR2STR(ksys_error);
+    ERR2STR(ksys_create_file_error);
+    ERR2STR(ksys_create_dir_error);
+    ERR2STR(ksys_open_file_error);
+    ERR2STR(ksys_open_dir_error);
+    ERR2STR(ksys_read_file_error);
+    ERR2STR(ksys_write_file_error);
+    ERR2STR(ksys_close_file_error);
+    ERR2STR(ksys_close_dir_error);
+    ERR2STR(ksys_delete_file_error);
+    ERR2STR(ksys_delete_dir_error);
+    ERR2STR(ksys_copy_file_error);
+    ERR2STR(kce_device_not_zero);
+    ERR2STR(kce_over_temperature);
+    ERR2STR(kce_over_voltage);
+    ERR2STR(kce_param_out_of_range);
+    ERR2STR(kce_not_found_zero_point);
+    ERR2STR(kce_not_found_x_zero_point);
+    ERR2STR(kce_not_found_y_zero_point);
+    ERR2STR(kce_x_leave_away_zero_point_fail);
+    ERR2STR(kce_y_leave_away_zero_point_fail);
+    ERR2STR(kce_operation_not_support);
+    ERR2STR(kce_device_is_busy);
+    ERR2STR(kce_device_is_offline);
+    ERR2STR(kce_break_by_user);
+    ERR2STR(kce_overtime);
+    ERR2STR(kce_noack);
+    ERR2STR(kce_errorack);
+    ERR2STR(kce_device_offline);
+    ERR2STR(kce_parse_json_err);
+    ERR2STR(kce_subdevice_overtime);
+    ERR2STR(kdbe_user_not_exist);
+    ERR2STR(kdbe_catch_exception);
+    ERR2STR(kharde_unfound);
+    ERR2STR(kre_catch_exception);
+    ERR2STR(kinteraction_error_passwd_error);
+    ERR2STR(kinteraction_error_user_not_exist);
+    ERR2STR(kce_buffer_not_enough);
+    ERR2STR(kSMTP2_NoError);
+    ERR2STR(kSMTP2_InitFail);
+    ERR2STR(kSMTP2_InvalidCmd);
+    ERR2STR(kSMTP2_InvalidArg);
+    ERR2STR(kSMTP2_PressureSensorError);
+    ERR2STR(kSMTP2_OverPressure);
+    ERR2STR(kSMTP2_LLDError);
+    ERR2STR(kSMTP2_DeviceNotInit);
+    ERR2STR(kSMTP2_TipPopError);
+    ERR2STR(kSMTP2_PumpOverload);
+    ERR2STR(kSMTP2_TipDrop);
+    ERR2STR(kSMTP2_CanBusError);
+    ERR2STR(kSMTP2_InvalidChecksum);
+    ERR2STR(kSMTP2_EEPROMError);
+    ERR2STR(kSMTP2_CmdBufferEmpty);
+    ERR2STR(kSMTP2_CmdBufferOverflow);
+    ERR2STR(kSMTP2_TipBlock);
+    ERR2STR(kSMTP2_AirSuction);
+    ERR2STR(kSMTP2_Bubble);
+    ERR2STR(kSMTP2_VolumeError);
+    ERR2STR(kSMTP2_TipAlreadyLoad);
+    ERR2STR(kSMTP2_TipLoadFail);
+    default:
+      break;
+  }
+}
+}  // namespace err
+}  // namespace iflytop
\ No newline at end of file
diff --git a/errorcode.hpp b/errorcode.hpp
index 3a427d0..d1a0e1c 100644
--- a/errorcode.hpp
+++ b/errorcode.hpp
@@ -1,4 +1,5 @@
 #pragma once
+#include <stdint.h>
 
 namespace iflytop {
 namespace err {
@@ -83,5 +84,8 @@ typedef enum {
   kSMTP2_TipLoadFail         = ERROR_CODE(20000, 21),
 
 } error_t;
+
+ const char* error2str(int32_t code);
+
 }  // namespace err
 }  // namespace iflytop
\ No newline at end of file