diff --git a/devices/ec20/ec20.c b/devices/ec20/ec20.c
index b8ec6112..869febfa 100644
--- a/devices/ec20/ec20.c
+++ b/devices/ec20/ec20.c
@@ -1,7 +1,9 @@
 /**
- * @brief    Quectel EC20 LTGE Cat4 Module
- * @author   Mculover666 <2412828003@qq.com>
- * @date     2020/05/07
+ * @brief   Quectel EC20 LTGE Cat4 Module
+ * @author  Mculover666 <2412828003@qq.com>
+ * @date    2020/05/07
+ * @changelog
+            2020/05/21    Mculover666    Change recv mode is Direct Push Mode
 */
 
 #include "ec20.h"
@@ -18,7 +20,7 @@ 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");
+    tos_at_cmd_exec(&echo, 1000, "ATE0\r\n");
     if (echo.status == AT_ECHO_STATUS_OK)
     {
         return 0;
@@ -30,11 +32,12 @@ static int ec20_sim_card_check(void)
     at_echo_t echo;
     int try = 0;
     char echo_buffer[32];
-
+	
+	tos_at_echo_create(&echo, echo_buffer, sizeof(echo_buffer), NULL);
     while (try++ < 10)
 	{
-        tos_at_echo_create(&echo, echo_buffer, sizeof(echo_buffer), NULL);
-        tos_at_cmd_exec(&echo, 2000, "AT+CPIN?\r\n");
+        
+        tos_at_cmd_exec(&echo, 1000, "AT+CPIN?\r\n");
         if (echo.status != AT_ECHO_STATUS_OK) {
                 return -1;
         }
@@ -55,10 +58,9 @@ static int ec20_signal_quality_check(void)
     char echo_buffer[32], *str;
 	int try = 0;
 	
-	
+	tos_at_echo_create(&echo, echo_buffer, sizeof(echo_buffer), NULL);
     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)
         {
@@ -81,9 +83,9 @@ static int ec20_gsm_network_check(void)
     char echo_buffer[32], *str;
 	int try = 0;
 	
+	tos_at_echo_create(&echo, echo_buffer, sizeof(echo_buffer), NULL);
 	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;
@@ -105,9 +107,10 @@ static int ec20_gprs_network_check(void)
     char echo_buffer[32], *str;
 	int try = 0;
 
+	tos_at_echo_create(&echo, echo_buffer, sizeof(echo_buffer), NULL);
 	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)
         {
@@ -166,7 +169,7 @@ static int ec20_init(void)
 
     if (ec20_echo_close() != 0)
     {
-        printf("echo close failed\n");
+        printf("echo close failed,please check your module\n");
         return -1;
     }
 		
@@ -221,7 +224,7 @@ static int ec20_connect(const char *ip, const char *port, sal_proto_t proto)
     }
 
 	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",
+    tos_at_cmd_exec(&echo, 4000, "AT+QIOPEN=1,%d,\"%s\",\"%s\",%d,0,1\r\n",
                         id, proto == TOS_SAL_PROTO_UDP ? "UDP" : "TCP", ip, atoi(port));
     if (echo.status == AT_ECHO_STATUS_OK)
 	{
@@ -246,6 +249,10 @@ int ec20_send(int id, const void *buf, size_t len)
 {
     at_echo_t echo;
 
+	if (!tos_at_channel_is_working(id)) {
+        return -1;
+    }
+	
     if (tos_at_global_lock_pend() != 0)
 	{
         return -1;
@@ -262,7 +269,7 @@ int ec20_send(int id, const void *buf, size_t len)
     }
 
     tos_at_echo_create(&echo, NULL, 0, "SEND OK");
-    tos_at_raw_data_send(&echo, 1000, (uint8_t *)buf, len);
+    tos_at_raw_data_send_until(&echo, 10000, (uint8_t *)buf, len);
     if (echo.status != AT_ECHO_STATUS_OK && echo.status != AT_ECHO_STATUS_EXPECT)
 	{
         tos_at_global_lock_post();
@@ -373,11 +380,10 @@ __STATIC__ void ec20_incoming_data_process(void)
     uint8_t buffer[128];
 
     /*
-		+QIURC: "recv",0
-
-        +QIURC:		prefix
-        0:          scoket id
+		+QIURC: "recv",<sockid>,<datalen>
+		<data content>
     */
+	
 	if (tos_at_uart_read(&data, 1) != 1)
 	{
 		return;
@@ -390,34 +396,13 @@ __STATIC__ void ec20_incoming_data_process(void)
             return;
         }
 
-        if (data == '\r')
+        if (data == ',')
         {
             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)
@@ -431,7 +416,6 @@ __STATIC__ void ec20_incoming_data_process(void)
         }
         data_len = data_len * 10 + (data - '0');
     }
-	printf("data_len = %d\n", data_len);
 
     if (tos_at_uart_read(&data, 1) != 1)
     {