diff --git a/firmware/application/src/app_cmd.c b/firmware/application/src/app_cmd.c
index 99c7d01..dbe49d3 100644
--- a/firmware/application/src/app_cmd.c
+++ b/firmware/application/src/app_cmd.c
@@ -473,7 +473,6 @@ data_frame_tx_t* cmd_processor_set_mf1_anti_collision_res(uint16_t cmd, uint16_t
 }
 
 data_frame_tx_t* cmd_processor_set_slot_tag_nick_name(uint16_t cmd, uint16_t status, uint16_t length, uint8_t *data) {
-    // one chinese have 2byte(gbk).
     if (length > 34 || length < 3) {
         status = STATUS_PAR_ERR;
     } else {
@@ -498,7 +497,6 @@ data_frame_tx_t* cmd_processor_set_slot_tag_nick_name(uint16_t cmd, uint16_t sta
 }
 
 data_frame_tx_t* cmd_processor_get_slot_tag_nick_name(uint16_t cmd, uint16_t status, uint16_t length, uint8_t *data) {
-    // one chinese have 2byte(gbk).
     if (length != 2) {
         status = STATUS_PAR_ERR;
     } else {
diff --git a/software/script/chameleon_cli_unit.py b/software/script/chameleon_cli_unit.py
index 15f056d..a6964aa 100644
--- a/software/script/chameleon_cli_unit.py
+++ b/software/script/chameleon_cli_unit.py
@@ -940,9 +940,10 @@ class HWSlotNickSet(SlotIndexRequireUint, SenseTypeRequireUint):
         slot_num = args.slot
         sense_type = args.sense_type
         name: str = args.name
-        if len(name.encode(encoding="gbk")) > 32:
+        uname = name.encode(encoding="utf8")
+        if len(uname) > 32:
             raise ValueError("Your tag nick name too long.")
-        self.cmd_positive.set_slot_tag_nick_name(slot_num, sense_type, name)
+        self.cmd_positive.set_slot_tag_nick_name(slot_num, sense_type, uname)
         print(f' - Set tag nick name for slot {slot_num} success.')
 
 
@@ -958,7 +959,7 @@ class HWSlotNickGet(SlotIndexRequireUint, SenseTypeRequireUint):
         slot_num = args.slot
         sense_type = args.sense_type
         res = self.cmd_positive.get_slot_tag_nick_name(slot_num, sense_type)
-        print(f' - Get tag nick name for slot {slot_num}: {res.data.decode(encoding="gbk")}')
+        print(f' - Get tag nick name for slot {slot_num}: {res.data.decode(encoding="utf8")}')
 
 
 class HWSlotUpdate(DeviceRequiredUnit):
diff --git a/software/script/chameleon_cmd.py b/software/script/chameleon_cmd.py
index 391f605..88ab7de 100644
--- a/software/script/chameleon_cmd.py
+++ b/software/script/chameleon_cmd.py
@@ -433,7 +433,7 @@ class BaseChameleonCMD:
         data.extend(uid)
         return self.device.send_cmd_sync(DATA_CMD_SET_MF1_ANTI_COLLISION_RES, 0X00, data)
     
-    def set_slot_tag_nick_name(self, slot: int, sense_type: int, name: str):
+    def set_slot_tag_nick_name(self, slot: int, sense_type: int, name: bytes):
         """
             设置MF1的模拟卡的防冲撞资源信息
         :param slot: 卡槽号码
@@ -443,7 +443,7 @@ class BaseChameleonCMD:
         """
         data = bytearray()
         data.extend([slot, sense_type])
-        data.extend(name.encode(encoding="gbk"))
+        data.extend(name)
         return self.device.send_cmd_sync(DATA_CMD_SET_SLOT_TAG_NICK, 0x00, data)
     
     def get_slot_tag_nick_name(self, slot: int, sense_type: int):
@@ -620,7 +620,7 @@ class PositiveChameleonCMD(BaseChameleonCMD):
         self.check_status(ret.status, chameleon_status.Device.STATUS_DEVICE_SUCCESS)
         return ret
     
-    def set_slot_tag_nick_name(self, slot: int, sense_type: int, name: str):
+    def set_slot_tag_nick_name(self, slot: int, sense_type: int, name: bytes):
         ret = super(PositiveChameleonCMD, self).set_slot_tag_nick_name(slot, sense_type, name)
         self.check_status(ret.status, chameleon_status.Device.STATUS_DEVICE_SUCCESS)
         return ret