diff --git a/core/components/modbus/modbus.cpp b/core/components/modbus/modbus.cpp
index f5e6935..e64de68 100644
--- a/core/components/modbus/modbus.cpp
+++ b/core/components/modbus/modbus.cpp
@@ -1,4 +1,5 @@
 #include "modbus.hpp"
+
 #include "iflytopcpp/core/components/stringutils.hpp"
 
 extern "C" {
@@ -151,11 +152,10 @@ int ModbusMaster::modbus10(uint8_t deviceid, uint16_t startreg, uint16_t regnum,
    *  成功回执:
    *    add(1)+0x10(1)+startreg(2)+regnum(2)+crc(2)
    *
-   *  所以此处只需关心前三个字节，是ADD+0x90+ErrorCode还是ADD+0x10+其他
    *
    */
-  uint8_t rxbuf[3] = {0};
-  int     rxsize   = 3;
+  uint8_t rxbuf[8] = {0};
+  int     rxsize   = 8;
   ret              = uartdev->receive((char*)rxbuf, rxsize, overtime);
   if (ret != rxsize) {
     logger->error("modbus10(d {},reg {}:{})::receive_packet_safe fail", deviceid, startreg, regnum);