diff --git a/components/tcpip_adapter/tcpip_adapter_lwip.c b/components/tcpip_adapter/tcpip_adapter_lwip.c
index d3a31d63..bf3f8bad 100644
--- a/components/tcpip_adapter/tcpip_adapter_lwip.c
+++ b/components/tcpip_adapter/tcpip_adapter_lwip.c
@@ -74,7 +74,6 @@ static esp_err_t tcpip_adapter_reset_ip_info(tcpip_adapter_if_t tcpip_if);
 static esp_err_t tcpip_adapter_start_ip_lost_timer(tcpip_adapter_if_t tcpip_if);
 static void tcpip_adapter_dhcpc_cb(struct netif *netif);
 static void tcpip_adapter_ip_lost_timer(void *arg);
-static void tcpip_adapter_dhcpc_done(TimerHandle_t arg);
 static bool tcpip_inited = false;
 
 static const char* TAG = "tcpip_adapter";
@@ -85,9 +84,25 @@ ESP_EVENT_DEFINE_BASE(IP_EVENT);
 err_t ethernetif_init(struct netif* netif);
 void system_station_got_ip_set();
 
-static int dhcp_fail_time = 0;
 static tcpip_adapter_ip_info_t esp_ip[TCPIP_ADAPTER_IF_MAX];
-static TimerHandle_t *dhcp_check_timer;
+
+static void tcpip_adapter_set_wifi_ps(bool flag)
+{
+    static bool is_ps_set = false;
+    if (flag) {
+        if (!is_ps_set) {
+            ESP_LOGD(TAG, "enable wifi ps");
+            esp_wifi_ps_lock();
+            is_ps_set = true;
+        }
+    } else {
+        if (is_ps_set) {
+            ESP_LOGD(TAG, "disable wifi ps");
+            esp_wifi_ps_unlock();
+            is_ps_set = false;
+        }
+    }
+}
 
 static void tcpip_adapter_dhcps_cb(u8_t client_ip[4])
 {
@@ -192,11 +207,6 @@ void tcpip_adapter_init(void)
         IP4_ADDR(&esp_ip[TCPIP_ADAPTER_IF_AP].ip, 192, 168 , 4, 1);
         IP4_ADDR(&esp_ip[TCPIP_ADAPTER_IF_AP].gw, 192, 168 , 4, 1);
         IP4_ADDR(&esp_ip[TCPIP_ADAPTER_IF_AP].netmask, 255, 255 , 255, 0);
-
-        dhcp_check_timer = xTimerCreate("check_dhcp", 500 / portTICK_RATE_MS, true, NULL, tcpip_adapter_dhcpc_done);
-        if (!dhcp_check_timer) {
-            ESP_LOGI(TAG, "TCPIP adapter timer create error");
-        }
     }
 }
 
@@ -287,56 +297,6 @@ static int tcpip_adapter_sta_recv_cb(void *buffer, uint16_t len, void *eb)
     return tcpip_adapter_recv_cb(esp_netif[ESP_IF_WIFI_STA], buffer, len, eb);
 }
 
-static void tcpip_adapter_dhcpc_done(TimerHandle_t xTimer)
-{
-    bool unlock_ps = true;
-    struct dhcp *clientdhcp = netif_dhcp_data(esp_netif[TCPIP_ADAPTER_IF_STA]) ;
-    struct netif *netif = esp_netif[TCPIP_ADAPTER_IF_STA];
-
-    if (!netif) {
-        ESP_LOGD(TAG, "null netif=%p", netif);
-        return;
-    }
-
-#if LWIP_IPV4 && LWIP_AUTOIP
-    struct autoip *autoip = netif_autoip_data(netif);
-#endif
-
-    xTimerStop(dhcp_check_timer, 0);
-    if (netif_is_up(esp_netif[TCPIP_ADAPTER_IF_STA])) {
-        if ((clientdhcp && clientdhcp->state == DHCP_STATE_BOUND)
-#if LWIP_IPV4 && LWIP_AUTOIP
-            || (autoip && autoip->state == AUTOIP_STATE_ANNOUNCING)
-#endif
-        ) {
-            /*send event here*/
-            tcpip_adapter_dhcpc_cb(esp_netif[TCPIP_ADAPTER_IF_STA]);
-            ESP_LOGD(TAG,"ip:" IPSTR ",mask:" IPSTR ",gw:" IPSTR "\n", IP2STR(ip_2_ip4(&(esp_netif[0]->ip_addr))),
-                IP2STR(ip_2_ip4(&(esp_netif[0]->netmask))), IP2STR(ip_2_ip4(&(esp_netif[0]->gw))));
-            dhcp_fail_time = 0;
-        } else if (dhcp_fail_time < (CONFIG_IP_LOST_TIMER_INTERVAL * 1000 / 500)) {
-            ESP_LOGD(TAG,"dhcpc time(ms): %d\n", dhcp_fail_time * 500);
-            dhcp_fail_time ++;
-            xTimerReset(dhcp_check_timer, 0);
-            unlock_ps = false;
-        } else {
-            dhcp_fail_time = 0;
-            ESP_LOGD(TAG,"ERROR dhcp get ip error\n");
-        }
-    } else {
-        dhcp_fail_time = 0;
-        tcpip_adapter_release_dhcp(esp_netif[TCPIP_ADAPTER_IF_STA]);
-
-        dhcpc_status[TCPIP_ADAPTER_IF_STA] = TCPIP_ADAPTER_DHCP_INIT;
-
-        tcpip_adapter_reset_ip_info(TCPIP_ADAPTER_IF_STA);
-    }
-
-    if (unlock_ps) {
-       esp_wifi_ps_unlock();
-    }
-}
-
 static esp_err_t tcpip_adapter_update_default_netif(void)
 {
     if ((esp_netif[TCPIP_ADAPTER_IF_STA] != NULL) && netif_is_up(esp_netif[TCPIP_ADAPTER_IF_STA])) {
@@ -1073,6 +1033,7 @@ static void tcpip_adapter_dhcpc_cb(struct netif *netif)
         }
     }
 
+    tcpip_adapter_set_wifi_ps(false);
     return;
 }
 
@@ -1171,16 +1132,13 @@ esp_err_t tcpip_adapter_dhcpc_start(tcpip_adapter_if_t tcpip_if)
                 return ESP_OK;
             }
 
-            esp_wifi_ps_lock();
+            tcpip_adapter_set_wifi_ps(true);
 
             if (tcpip_adapter_start_dhcp(p_netif) != ERR_OK) {
-                esp_wifi_ps_unlock();
+                tcpip_adapter_set_wifi_ps(false);
                 ESP_LOGD(TAG, "dhcp client start failed");
                 return ESP_ERR_TCPIP_ADAPTER_DHCPC_START_FAILED;
             }
-
-            dhcp_fail_time = 0;
-            xTimerReset(dhcp_check_timer, portMAX_DELAY);
             ESP_LOGD(TAG, "dhcp client start successfully");
             dhcpc_status[tcpip_if] = TCPIP_ADAPTER_DHCP_STARTED;
             return ESP_OK;