diff --git a/components/lwip/apps/dhcpserver/dhcpserver.c b/components/lwip/apps/dhcpserver/dhcpserver.c
index ae441e2b..dc0f2886 100644
--- a/components/lwip/apps/dhcpserver/dhcpserver.c
+++ b/components/lwip/apps/dhcpserver/dhcpserver.c
@@ -1154,6 +1154,7 @@ void dhcps_start(struct netif *netif, ip4_addr_t ip)
 
     udp_bind(pcb_dhcps, &netif->ip_addr, DHCPS_SERVER_PORT);
     udp_recv(pcb_dhcps, handle_dhcp, NULL);
+    sys_timeout(1000, dhcps_coarse_tmr, NULL);
 #if DHCPS_DEBUG
     DHCPS_LOG("dhcps:dhcps_start->udp_recv function Set a receive callback handle_dhcp for UDP_PCB pcb_dhcps\n");
 #endif
@@ -1175,6 +1176,8 @@ void dhcps_stop(struct netif *netif)
         return;
     }
 
+    sys_untimeout(dhcps_coarse_tmr, NULL);
+
     if (pcb_dhcps != NULL) {
         udp_disconnect(pcb_dhcps);
         udp_remove(pcb_dhcps);
@@ -1267,6 +1270,11 @@ void dhcps_coarse_tmr(void)
     if (num_dhcps_pool > MAX_STATION_NUM) {
         kill_oldest_dhcps_pool();
     }
+
+    /*Do not restart timer when dhcp server is stopped*/
+    if  (pcb_dhcps != NULL) {
+        sys_timeout(1000, dhcps_coarse_tmr, NULL);
+    }
 }
 
 /******************************************************************************
diff --git a/components/lwip/include/lwip/apps/dhcpserver/dhcpserver.h b/components/lwip/include/lwip/apps/dhcpserver/dhcpserver.h
index 10186fe7..6e3363b7 100644
--- a/components/lwip/include/lwip/apps/dhcpserver/dhcpserver.h
+++ b/components/lwip/include/lwip/apps/dhcpserver/dhcpserver.h
@@ -89,6 +89,7 @@ bool dhcp_search_ip_on_mac(u8_t *mac, ip4_addr_t *ip);
 void dhcps_dns_setserver(const ip_addr_t *dnsserver);
 ip4_addr_t dhcps_dns_getserver();
 void dhcps_set_new_lease_cb(dhcps_cb_t cb);
+void dhcps_coarse_tmr(void);
 
 #endif