diff --git a/devices/ec20/ec20.c b/devices/ec20/ec20.c
new file mode 100644
index 00000000..c14ad84f
--- /dev/null
+++ b/devices/ec20/ec20.c
@@ -0,0 +1,447 @@
+/**
+ * @brief    Quectel EC20 LTGE Cat4 Module
+ * @author   Mculover666 <2412828003@qq.com>
+ * @date     2020/05/07
+*/
+
+#include "ec20.h"
+#include "tos_at.h"
+#include "tos_hal.h"
+#include "sal_module_wrapper.h"
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <ctype.h>
+
+static int ec20_echo_close(void)
+{
+    at_echo_t echo;
+
+    tos_at_echo_create(&echo, NULL, 0, NULL);
+    tos_at_cmd_exec(&echo, 300, "ATE0\r\n");
+    if (echo.status == AT_ECHO_STATUS_OK)
+    {
+        return 0;
+    }
+    return -1;
+}
+static int ec20_sim_card_check(void)
+{
+    at_echo_t echo;
+    int try = 0;
+    char echo_buffer[32];
+
+    while (try++ < 10)
+	{
+        tos_at_echo_create(&echo, echo_buffer, sizeof(echo_buffer), NULL);
+        tos_at_cmd_exec(&echo, 2000, "AT+CPIN?\r\n");
+        if (echo.status != AT_ECHO_STATUS_OK) {
+                return -1;
+        }
+
+        if(strstr(echo.buffer, "READY"))
+        {
+            return 0;
+        }
+    }
+		 
+	return -1;
+}
+
+static int ec20_signal_quality_check(void)
+{
+    int rssi, ber;
+    at_echo_t echo;
+    char echo_buffer[32], *str;
+	int try = 0;
+	
+	
+    while (try++ < 10) 
+    {
+        tos_at_echo_create(&echo, echo_buffer, sizeof(echo_buffer), NULL);
+        tos_at_cmd_exec(&echo, 1000, "AT+CSQ\r\n");
+        if (echo.status != AT_ECHO_STATUS_OK)
+        {
+            return -1;
+        }
+
+        str = strstr(echo.buffer, "+CSQ:");
+        sscanf(str, "+CSQ:%d,%d", &rssi, &ber);
+        if (rssi != 99) {
+            return 0;
+        }
+    }
+
+    return -1;
+}
+static int ec20_gsm_network_check(void)
+{
+    int n, stat;
+    at_echo_t echo;
+    char echo_buffer[32], *str;
+	int try = 0;
+	
+	while (try++ < 10)
+    {
+        tos_at_echo_create(&echo, echo_buffer, sizeof(echo_buffer), NULL);
+        tos_at_cmd_exec(&echo, 1000, "AT+CREG?\r\n");
+        if (echo.status != AT_ECHO_STATUS_OK) {
+            return -1;
+        }
+
+        str = strstr(echo.buffer, "+CREG:");
+        sscanf(str, "+CREG:%d,%d", &n, &stat);
+        if (stat == 1) {
+            return 0;
+        }
+	}
+    return -1;	
+}
+
+static int ec20_gprs_network_check(void)
+{
+    int n, stat;
+    at_echo_t echo;
+    char echo_buffer[32], *str;
+	int try = 0;
+
+	while (try++ < 10)
+    {
+        tos_at_echo_create(&echo, echo_buffer, sizeof(echo_buffer), NULL);
+        tos_at_cmd_exec(&echo, 1000, "AT+CGREG?\r\n");
+        if (echo.status != AT_ECHO_STATUS_OK)
+        {
+            return -1;
+        }
+
+        str = strstr(echo.buffer, "+CGREG:");
+        sscanf(str, "+CGREG:%d,%d", &n, &stat);
+        if (stat == 1)
+        {
+            return 0;
+        }
+	}
+		
+    return -1;	
+}
+
+static int ec20_close_apn(void)
+{
+    at_echo_t echo;
+
+    tos_at_echo_create(&echo, NULL, 0, NULL);
+    tos_at_cmd_exec(&echo, 3000, "AT+QIDEACT=1\r\n");
+   	if (echo.status == AT_ECHO_STATUS_OK)
+	{
+		return 0;
+	}
+   
+	return -1;
+}
+
+static int ec20_set_apn(void)
+{
+    at_echo_t echo;
+
+    tos_at_echo_create(&echo, NULL, 0, NULL);
+    tos_at_cmd_exec(&echo, 300, "AT+QICSGP=1,1,\"CMNET\"\r\n");
+    if (echo.status != AT_ECHO_STATUS_OK)
+    {
+        return -1;
+    }
+
+
+	tos_at_cmd_exec(&echo, 3000, "AT+QIACT=1\r\n");
+    if (echo.status != AT_ECHO_STATUS_OK)
+    {
+        return -1;
+    }	
+
+    return 0;
+}
+
+static int ec20_init(void)
+{
+    printf("Init ec20 ...\n" );
+
+    if (ec20_echo_close() != 0)
+    {
+        printf("echo close failed\n");
+        return -1;
+    }
+		
+    if(ec20_sim_card_check() != 0)
+    {
+        printf("sim card check failed,please insert your card\n");
+        return -1;
+    }
+
+    if (ec20_signal_quality_check() != 0)
+    {
+        printf("signal quality check status failed\n");
+        return -1;
+    }
+		
+    if(ec20_gsm_network_check() != 0)
+    {
+        printf("GSM network register status check fail\n");
+        return -1;
+    }
+    
+    if(ec20_gprs_network_check() != 0)
+    {
+        printf("GPRS network register status check fail\n");
+        return -1;
+    }
+    
+    if(ec20_close_apn() != 0)
+    {
+        printf("close apn failed\n");
+        return -1;
+    }
+		
+    if (ec20_set_apn() != 0) {
+        printf("apn set FAILED\n");
+        return -1;
+    }
+
+    printf("Init ec20 ok\n" );
+    return 0;
+}
+
+static int ec20_connect(const char *ip, const char *port, sal_proto_t proto)
+{
+    int id;
+    at_echo_t echo;
+
+    id = tos_at_channel_alloc(ip, port);
+    if (id == -1)
+	{
+        return -1;
+    }
+
+	tos_at_echo_create(&echo, NULL, 0, "CONNECT OK");
+    tos_at_cmd_exec(&echo, 4000, "AT+QIOPEN=1,%d,\"%s\",\"%s\",%d,0,0\r\n",
+                        id, proto == TOS_SAL_PROTO_UDP ? "UDP" : "TCP", ip, atoi(port));
+    if (echo.status == AT_ECHO_STATUS_OK)
+	{
+        return id;
+    }
+		
+    tos_at_channel_free(id);
+    return -1;
+}
+
+static int ec20_recv_timeout(int id, void *buf, size_t len, uint32_t timeout)
+{
+    return tos_at_channel_read_timed(id, buf, len, timeout);
+}
+
+static int ec20_recv(int id, void *buf, size_t len)
+{
+    return ec20_recv_timeout(id, buf, len, (uint32_t)4000);
+}
+
+int ec20_send(int id, const void *buf, size_t len)
+{
+    at_echo_t echo;
+
+    if (tos_at_global_lock_pend() != 0)
+	{
+        return -1;
+    }
+
+    tos_at_echo_create(&echo, NULL, 0, ">");
+
+	tos_at_cmd_exec(&echo, 1000, "AT+QISEND=%d,%d\r\n", id, len);
+
+    if (echo.status != AT_ECHO_STATUS_OK && echo.status != AT_ECHO_STATUS_EXPECT)
+	{
+        tos_at_global_lock_post();
+        return -1;
+    }
+
+    tos_at_echo_create(&echo, NULL, 0, "SEND OK");
+    tos_at_raw_data_send(&echo, 1000, (uint8_t *)buf, len);
+    if (echo.status != AT_ECHO_STATUS_OK && echo.status != AT_ECHO_STATUS_EXPECT)
+	{
+        tos_at_global_lock_post();
+        return -1;
+    }
+
+    tos_at_global_lock_post();
+
+    return len;
+}
+
+static void ec20_transparent_mode_exit(void)
+{
+    tos_at_cmd_exec(NULL, 500, "+++");
+}
+
+static int ec20_close(int id)
+{
+    ec20_transparent_mode_exit();
+
+	tos_at_cmd_exec(NULL, 1000, "AT+QICLOSE=%d\r\n", id);
+
+    tos_at_channel_free(id);
+
+    return 0;
+}
+
+static int ec20_parse_domain(const char *host_name, char *host_ip, size_t host_ip_len)
+{
+    char *str;
+    at_echo_t echo;
+    char echo_buffer[128];
+
+    tos_at_echo_create(&echo, echo_buffer, sizeof(echo_buffer), NULL);
+    tos_at_cmd_exec(&echo, 2000, "AT+QIDNSGIP=1,\"%s\"\r\n", host_name);
+
+    if (echo.status != AT_ECHO_STATUS_OK)
+	{
+        return -1;
+    }
+
+    /*
+        +QIURC: "dnsgip",0,1,600
+
+		+QIURC: "dnsgip","xxx.xxx.xxx"
+    */
+
+    int seg1, seg2, seg3, seg4;
+    str = strstr(echo.buffer, "dnsgip");
+	*str = '0';
+	str = strstr(echo.buffer, "dnsgip");
+    str += strlen("dnsgip\",\"");
+    sscanf(str, "%d.%d.%d.%d", &seg1, &seg2, &seg3, &seg4);
+    snprintf(host_ip, host_ip_len, "%d.%d.%d.%d", seg1, seg2, seg3, seg4);
+    host_ip[host_ip_len - 1] = '\0';
+
+    printf("GOT IP: %s\n", host_ip);
+
+    return 0;
+}
+
+__STATIC__ void ec20_incoming_data_process(void)
+{
+    uint8_t data;
+    int channel_id = 0, data_len = 0, read_len;
+    uint8_t buffer[128];
+	char recv_check[10];
+
+    /*
+		+QIURC: "recv",0
+
+        +QIURC:		prefix
+        0:          scoket id
+    */
+	if (tos_at_uart_read(&data, 1) != 1)
+	{
+		return;
+	}
+	
+    while (1)
+    {
+        if (tos_at_uart_read(&data, 1) != 1)
+        {
+            return;
+        }
+
+        if (data == '\r')
+        {
+            break;
+        }
+        channel_id = channel_id * 10 + (data - '0');
+    }
+	printf("channel id = %d\n", channel_id);
+	
+	tos_at_cmd_exec(NULL, 0, "AT+QIRD=%d,%d\r\n", channel_id, sizeof(buffer));
+	
+	while (1)
+    {
+        if (tos_at_uart_read(&data, 1) != 1)
+        {
+            return;
+        }
+
+        if (data == ':')
+        {
+            break;
+        }
+	}
+	
+	if (tos_at_uart_read(&data, 1) != 1)
+	{
+		return;
+	}
+	
+	while (1)
+    {
+        if (tos_at_uart_read(&data, 1) != 1)
+        {
+            return;
+        }
+
+        if (data == '\r')
+        {
+            break;
+        }
+        data_len = data_len * 10 + (data - '0');
+    }
+	printf("data_len = %d\n", data_len);
+
+    if (tos_at_uart_read(&data, 1) != 1)
+    {
+        return;
+    }
+		
+    do {
+#define MIN(a, b)   ((a) < (b) ? (a) : (b))
+        read_len = MIN(data_len, sizeof(buffer));
+        if (tos_at_uart_read(buffer, read_len) != read_len) {
+            return;
+        }
+
+        if (tos_at_channel_write(channel_id, buffer, read_len) <= 0) {
+            return;
+        }
+
+        data_len -= read_len;
+    } while (data_len > 0);
+
+	return;
+}
+
+at_event_t ec20_at_event[] = {
+	{ "+QIURC: \"recv\"", ec20_incoming_data_process},
+};
+
+sal_module_t sal_module_ec20 = {
+    .init           = ec20_init,
+    .connect        = ec20_connect,
+    .send           = ec20_send,
+    .recv_timeout   = ec20_recv_timeout,
+    .recv           = ec20_recv,
+    .close          = ec20_close,
+    .parse_domain   = ec20_parse_domain,
+};
+
+int ec20_sal_init(hal_uart_port_t uart_port)
+{
+    if (tos_at_init(uart_port, ec20_at_event,
+                        sizeof(ec20_at_event) / sizeof(ec20_at_event[0])) != 0) {
+        return -1;
+    }
+
+    if (tos_sal_module_register(&sal_module_ec20) != 0) {
+        return -1;
+    }
+    if (tos_sal_module_init() != 0) {
+        return -1;
+    }
+		
+    return 0;
+}
+
diff --git a/devices/ec20/ec20.h b/devices/ec20/ec20.h
new file mode 100644
index 00000000..aaa7669e
--- /dev/null
+++ b/devices/ec20/ec20.h
@@ -0,0 +1,31 @@
+/*----------------------------------------------------------------------------
+ * Tencent is pleased to support the open source community by making TencentOS
+ * available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ * If you have downloaded a copy of the TencentOS binary from Tencent, please
+ * note that the TencentOS binary is licensed under the BSD 3-Clause License.
+ *
+ * If you have downloaded a copy of the TencentOS source code from Tencent,
+ * please note that TencentOS source code is licensed under the BSD 3-Clause
+ * License, except for the third-party components listed below which are
+ * subject to different license terms. Your integration of TencentOS into your
+ * own projects may require compliance with the BSD 3-Clause License, as well
+ * as the other licenses applicable to the third-party components included
+ * within TencentOS.
+ *---------------------------------------------------------------------------*/
+
+#ifndef __EC20_H__
+#define __EC20_H__
+
+#include "tos_hal.h"
+
+typedef enum sal_send_mode {
+    SAL_SEND_MODE_NORMAL,
+    SAL_SEND_MODE_TRANSPARENT,
+} sal_send_mode_t;
+
+int ec20_sal_init(hal_uart_port_t uart_port);
+
+#endif /* __EC20_H__ */
+