diff --git a/components/lwip/apps/multi-threads/sockets_mt.c b/components/lwip/apps/multi-threads/sockets_mt.c
index 901895d2..b6561912 100644
--- a/components/lwip/apps/multi-threads/sockets_mt.c
+++ b/components/lwip/apps/multi-threads/sockets_mt.c
@@ -170,12 +170,12 @@ static volatile sock_mt_t DRAM_ATTR sockets_mt[NUM_SOCKETS];
 
 static inline void _sock_mt_init(int s)
 {
-    memset((void *)&sockets_mt[s], 0, sizeof(sock_mt_t));
+    memset((void *)&sockets_mt[s - LWIP_SOCKET_OFFSET], 0, sizeof(sock_mt_t));
 }
 
 static inline int _sock_is_opened(int s)
 {
-    return sockets_mt[s].opened != 0;
+    return sockets_mt[s - LWIP_SOCKET_OFFSET].opened != 0;
 }
 
 static inline void _sock_set_open(int s, int opened)
@@ -183,7 +183,7 @@ static inline void _sock_set_open(int s, int opened)
     SYS_ARCH_DECL_PROTECT(lev);
 
     SYS_ARCH_PROTECT(lev);
-    sockets_mt[s].opened = opened;
+    sockets_mt[s - LWIP_SOCKET_OFFSET].opened = opened;
     SYS_ARCH_UNPROTECT(lev);
 }
 
@@ -192,23 +192,23 @@ static inline void _sock_set_state(int s, int state)
     SYS_ARCH_DECL_PROTECT(lev);
 
     SYS_ARCH_PROTECT(lev);
-    sockets_mt[s].state = state;
+    sockets_mt[s - LWIP_SOCKET_OFFSET].state = state;
     SYS_ARCH_UNPROTECT(lev);
 }
 
 static inline int _sock_get_state(int s)
 {
-    return sockets_mt[s].state;
+    return sockets_mt[s - LWIP_SOCKET_OFFSET].state;
 }
 
 static inline int _sock_get_select(int s, int select)
 {
-    return sockets_mt[s].select & select;
+    return sockets_mt[s - LWIP_SOCKET_OFFSET].select & select;
 }
 
 static int inline _sock_is_lock(int s, int l)
 {
-    return sockets_mt[s].lock & l;
+    return sockets_mt[s - LWIP_SOCKET_OFFSET].lock & l;
 }
 
 static int inline _sock_next_lock(int lock)
@@ -221,7 +221,7 @@ static void inline _sock_set_select(int s, int select)
     SYS_ARCH_DECL_PROTECT(lev);
 
     SYS_ARCH_PROTECT(lev);
-    sockets_mt[s].select |= select;
+    sockets_mt[s - LWIP_SOCKET_OFFSET].select |= select;
     SYS_ARCH_UNPROTECT(lev);
 }
 
@@ -230,7 +230,7 @@ static void inline _sock_reset_select(int s, int select)
     SYS_ARCH_DECL_PROTECT(lev);
 
     SYS_ARCH_PROTECT(lev);
-    sockets_mt[s].select &= ~select;
+    sockets_mt[s - LWIP_SOCKET_OFFSET].select &= ~select;
     SYS_ARCH_UNPROTECT(lev);
 }
 
@@ -244,13 +244,13 @@ static int _sock_try_lock(int s, int l)
         goto exit;
     }
 
-    if (sockets_mt[s].lock & l) {
+    if (sockets_mt[s - LWIP_SOCKET_OFFSET].lock & l) {
         ret = ERR_INPROGRESS;
         goto exit;
     }
 
     SYS_ARCH_PROTECT(lev);
-    sockets_mt[s].lock |= l;
+    sockets_mt[s - LWIP_SOCKET_OFFSET].lock |= l;
     SYS_ARCH_UNPROTECT(lev);
 
 exit:
@@ -287,7 +287,7 @@ static int _sock_unlock(int s, int l)
     SOCK_MT_DEBUG(1, "s %d l %d exit ", s, l);
 
     SYS_ARCH_PROTECT(lev);
-    sockets_mt[s].lock &= ~l;
+    sockets_mt[s - LWIP_SOCKET_OFFSET].lock &= ~l;
     SYS_ARCH_UNPROTECT(lev);
 
     if (!_sock_is_opened(s)) {
@@ -305,7 +305,7 @@ static int lwip_enter_mt_select(int s, fd_set *read_set, fd_set *write_set)
 {
     int i;
 
-    if (s > NUM_SOCKETS || s < 0)
+    if (s > NUM_SOCKETS + LWIP_SOCKET_OFFSET || s < LWIP_SOCKET_OFFSET)
         return -1;
 
     for (i = 0; i < s; i++) {