diff --git a/xsync.cpp b/xsync.cpp
index 06f34c3..bab8794 100644
--- a/xsync.cpp
+++ b/xsync.cpp
@@ -108,7 +108,7 @@ xs_error_code_t Xsync::xsync_send_cmd_block(iflytop_xsync_packet_header_t *cmd,
   return (xs_error_code_t)rx_data->data[0];
 }
 
-xs_error_code_t Xsync::reg_write(uint32_t regadd, uint32_t regvalue) {
+xs_error_code_t Xsync::reg_write(uint32_t regadd, uint32_t regvalue, uint32_t &regbackvalue) {
   /**
    * @brief
    *      协议说明
@@ -136,6 +136,7 @@ xs_error_code_t Xsync::reg_write(uint32_t regadd, uint32_t regvalue) {
     return ecode;
   }
 
+  regbackvalue = rxpacket->data[1];
   return ecode;
 }
 
diff --git a/xsync.hpp b/xsync.hpp
index 798dadb..86a80cc 100644
--- a/xsync.hpp
+++ b/xsync.hpp
@@ -78,7 +78,7 @@ class Xsync {
   void regOnTimecodeMsg(xsync_on_timecode_msg_t on_timecode_msg_cb);
   void regOnCameraSyncMsg(xsync_on_camera_sync_msg_t on_camera_sync_msg_cb);
 
-  xs_error_code_t reg_write(uint32_t regadd, uint32_t regvalue);
+  xs_error_code_t reg_write(uint32_t regadd, uint32_t regvalue, uint32_t &regbackvalue);
   xs_error_code_t reg_read(uint32_t regadd, uint32_t &regvalue);
   xs_error_code_t reg_read_muti(uint32_t regadd, uint32_t nreg, vector<uint32_t> &regvalues);