diff --git a/APP_Framework/Framework/connection/4g/ec200t/ec200t.c b/APP_Framework/Framework/connection/4g/ec200t/ec200t.c
index 7f9ba7132..47e0ff525 100644
--- a/APP_Framework/Framework/connection/4g/ec200t/ec200t.c
+++ b/APP_Framework/Framework/connection/4g/ec200t/ec200t.c
@@ -163,8 +163,8 @@ static int Ec200tIoctl(struct Adapter *adapter, int cmd, void *args)
     serial_cfg.serial_parity_mode = PARITY_NONE;
     serial_cfg.serial_bit_order = STOP_BITS_1;
     serial_cfg.serial_invert_mode = NRZ_NORMAL;
-    //serial receive timeout 1s
-    serial_cfg.serial_timeout = 1000;
+    //serial receive timeout 0.6s
+    serial_cfg.serial_timeout = 600;
     serial_cfg.is_ext_uart = 0;
 #ifdef ADAPTER_EC200T_DRIVER_EXT_PORT
     serial_cfg.is_ext_uart = 1;
diff --git a/Ubiquitous/XiZi_IIoT/tool/bootloader/ota/ota.c b/Ubiquitous/XiZi_IIoT/tool/bootloader/ota/ota.c
index e8a9d0ad2..e3d68c643 100644
--- a/Ubiquitous/XiZi_IIoT/tool/bootloader/ota/ota.c
+++ b/Ubiquitous/XiZi_IIoT/tool/bootloader/ota/ota.c
@@ -738,8 +738,8 @@ SHELL_EXPORT_CMD(SHELL_CMD_PERMISSION(0)|SHELL_CMD_TYPE(SHELL_TYPE_CMD_FUNC)|SHE
 
 
 #ifdef OTA_BY_PLATFORM
-#define FRAME_LEN   256   //每帧数据的数据包长度
-static uint8_t MqttRxbuf[512];
+#define FRAME_LEN   1024   //每帧数据的数据包长度
+static uint8_t MqttRxbuf[2048];
 static uint8_t FrameBuf[FRAME_LEN];
 static OTA_TCB AliOTA;
 /*******************************************************************************
@@ -806,7 +806,7 @@ static void app_ota_by_platform(void)
     while(1)
     {
         memset(MqttRxbuf,0,sizeof(MqttRxbuf));
-        datalen = MQTT_Recv(MqttRxbuf, 512);
+        datalen = MQTT_Recv(MqttRxbuf, sizeof(MqttRxbuf));
         if(datalen > 0 && (MqttRxbuf[0] == 0x30))
         {
             MQTT_DealPublishData(MqttRxbuf, datalen);
@@ -879,7 +879,7 @@ static void app_ota_by_platform(void)
         ota_info.down.crc32= calculate_crc32(DOWN_FLAH_ADDRESS, AliOTA.size);
 
         memset(ota_info.down.version,0,sizeof(ota_info.down.version)); 
-        create_version(ota_info.os.version, ota_info.down.version);
+        strncpy(ota_info.down.version, AliOTA.version, sizeof(ota_info.down.version));
 
         memset(ota_info.down.description,0,sizeof(ota_info.down.description)); 
         strncpy(ota_info.down.description, "MQTT OTA bin.",sizeof(ota_info.down.description));
diff --git a/Ubiquitous/XiZi_IIoT/tool/mqtt/aliyun_mqtt.h b/Ubiquitous/XiZi_IIoT/tool/mqtt/aliyun_mqtt.h
index baad5e4a6..f44517c90 100644
--- a/Ubiquitous/XiZi_IIoT/tool/mqtt/aliyun_mqtt.h
+++ b/Ubiquitous/XiZi_IIoT/tool/mqtt/aliyun_mqtt.h
@@ -30,8 +30,8 @@
 #define SERVERIP   "101.133.196.127"
 #define SERVERPORT "1883"
 
-#define  PACK_SIZE 512  //存放报文数据缓冲区大小
-#define  CMD_SIZE  512  //保存推送的PUBLISH报文中的数据缓冲区大小
+#define  PACK_SIZE 512   //存放报文数据缓冲区大小
+#define  CMD_SIZE  2048  //保存推送的PUBLISH报文中的数据缓冲区大小
 
 typedef struct{ 
     uint8_t  Pack_buff[PACK_SIZE]; //存放发送报文数据缓冲区