diff --git a/bsp/nuvoton/libraries/m460/rtt_port/drv_common.c b/bsp/nuvoton/libraries/m460/rtt_port/drv_common.c
index cb12e1fcb51..adbe38618ea 100644
--- a/bsp/nuvoton/libraries/m460/rtt_port/drv_common.c
+++ b/bsp/nuvoton/libraries/m460/rtt_port/drv_common.c
@@ -167,12 +167,12 @@ void devmem(int argc, char *argv[])
 
     if (argc == 3)
     {
-        if (sscanf(argv[2], "0x%x", &value) != 1)
+        if (rt_sscanf(argv[2], "0x%x", &value) != 1)
             goto exit_devmem;
         mode = 1; /*Write*/
     }
 
-    if (sscanf(argv[1], "0x%x", &u32Addr) != 1)
+    if (rt_sscanf(argv[1], "0x%x", &u32Addr) != 1)
         goto exit_devmem;
     else if (!u32Addr || u32Addr & (4 - 1))
         goto exit_devmem;
@@ -203,12 +203,12 @@ void devmem2(int argc, char *argv[])
 
     if (argc == 3)
     {
-        if (sscanf(argv[2], "%u", &value) != 1)
+        if (rt_sscanf(argv[2], "%u", &value) != 1)
             goto exit_devmem;
         word_count = value;
     }
 
-    if (sscanf(argv[1], "0x%x", &u32Addr) != 1)
+    if (rt_sscanf(argv[1], "0x%x", &u32Addr) != 1)
         goto exit_devmem;
     else if (!u32Addr || u32Addr & (4 - 1))
         goto exit_devmem;
diff --git a/bsp/nuvoton/libraries/ma35/rtt_port/drv_disp.c b/bsp/nuvoton/libraries/ma35/rtt_port/drv_disp.c
index 842c567882d..ddb3cb1d6da 100644
--- a/bsp/nuvoton/libraries/ma35/rtt_port/drv_disp.c
+++ b/bsp/nuvoton/libraries/ma35/rtt_port/drv_disp.c
@@ -399,7 +399,7 @@ static rt_err_t lcd_set_overlay_colkey(int argc, char **argv)
 
     for (index = 0; index < (len - 1); index ++)
     {
-        if (sscanf(argv[index + 1], "%x", &arg[index]) != 1)
+        if (rt_sscanf(argv[index + 1], "%x", &arg[index]) != 1)
             return -1;
     }
     rt_kprintf("colkeylow:0x%08x colkeyhigh:0x%08x\n", arg[0], arg[1]);
@@ -459,7 +459,7 @@ static rt_err_t lcd_set_alphablend_opmode(int argc, char **argv)
 
     for (index = 0; index < (len - 1); index ++)
     {
-        if (sscanf(argv[index + 1], "%x", &arg[index]) != 1)
+        if (rt_sscanf(argv[index + 1], "%x", &arg[index]) != 1)
             return -1;
     }
 
diff --git a/bsp/nuvoton/libraries/ma35/rtt_port/drv_sys.c b/bsp/nuvoton/libraries/ma35/rtt_port/drv_sys.c
index d88df6677e7..302730c81f4 100644
--- a/bsp/nuvoton/libraries/ma35/rtt_port/drv_sys.c
+++ b/bsp/nuvoton/libraries/ma35/rtt_port/drv_sys.c
@@ -307,12 +307,12 @@ void devmem(int argc, char *argv[])
 
     if (argc == 3)
     {
-        if (sscanf(argv[2], "0x%x", &value) != 1)
+        if (rt_sscanf(argv[2], "0x%x", &value) != 1)
             goto exit_devmem;
         mode = 1; //Write
     }
 
-    if (sscanf(argv[1], "0x%x", &u32Addr) != 1)
+    if (rt_sscanf(argv[1], "0x%x", &u32Addr) != 1)
         goto exit_devmem;
     else if (u32Addr & (4 - 1))
         goto exit_devmem;
@@ -343,12 +343,12 @@ void devmem2(int argc, char *argv[])
 
     if (argc == 3)
     {
-        if (sscanf(argv[2], "%d", &value) != 1)
+        if (rt_sscanf(argv[2], "%d", &value) != 1)
             goto exit_devmem;
         word_count = value;
     }
 
-    if (sscanf(argv[1], "0x%x", &u32Addr) != 1)
+    if (rt_sscanf(argv[1], "0x%x", &u32Addr) != 1)
         goto exit_devmem;
     else if (u32Addr & (4 - 1))
         goto exit_devmem;
diff --git a/bsp/nuvoton/libraries/n9h30/rtt_port/drv_common.c b/bsp/nuvoton/libraries/n9h30/rtt_port/drv_common.c
index 620e439dda2..402c05a5dd7 100644
--- a/bsp/nuvoton/libraries/n9h30/rtt_port/drv_common.c
+++ b/bsp/nuvoton/libraries/n9h30/rtt_port/drv_common.c
@@ -90,12 +90,12 @@ void devmem(int argc, char *argv[])
 
     if (argc == 3)
     {
-        if (sscanf(argv[2], "0x%x", &value) != 1)
+        if (rt_sscanf(argv[2], "0x%x", &value) != 1)
             goto exit_devmem;
         mode = 1; //Write
     }
 
-    if (sscanf(argv[1], "0x%x", &u32Addr) != 1)
+    if (rt_sscanf(argv[1], "0x%x", &u32Addr) != 1)
         goto exit_devmem;
     else if (!u32Addr || u32Addr & (4 - 1))
         goto exit_devmem;
diff --git a/bsp/nuvoton/libraries/nu_packages/Demo/wormhole_demo.c b/bsp/nuvoton/libraries/nu_packages/Demo/wormhole_demo.c
index bf2b8d7ad7b..f079de13e49 100644
--- a/bsp/nuvoton/libraries/nu_packages/Demo/wormhole_demo.c
+++ b/bsp/nuvoton/libraries/nu_packages/Demo/wormhole_demo.c
@@ -298,12 +298,12 @@ void whc_devmem(int argc, char *argv[])
 
     if (argc == 3)
     {
-        if (sscanf(argv[2], "0x%x", &value) != 1)
+        if (rt_sscanf(argv[2], "0x%x", &value) != 1)
             goto exit_devmem;
         mode = 1; //Write
     }
 
-    if (sscanf(argv[1], "0x%x", &u32Addr) != 1)
+    if (rt_sscanf(argv[1], "0x%x", &u32Addr) != 1)
         goto exit_devmem;
     else if (u32Addr & (4 - 1))
         goto exit_devmem;
diff --git a/components/drivers/phy/ofw.c b/components/drivers/phy/ofw.c
index 77429ec4c45..316bbc2fde3 100644
--- a/components/drivers/phy/ofw.c
+++ b/components/drivers/phy/ofw.c
@@ -116,7 +116,7 @@ rt_err_t rt_ofw_get_phyid(struct rt_ofw_node *np,rt_uint32_t *id)
     if (ret)
         return ret;
 
-    ret = sscanf(phy_id,"ethernet-phy-id%4x.%4x",&upper, &lower);
+    ret = rt_sscanf(phy_id,"ethernet-phy-id%4x.%4x",&upper, &lower);
     if(ret != 2)
         return -RT_ERROR;
 
diff --git a/components/net/at/at_socket/at_socket.c b/components/net/at/at_socket/at_socket.c
index 4c5dee2b622..4695d3c102c 100644
--- a/components/net/at/at_socket/at_socket.c
+++ b/components/net/at/at_socket/at_socket.c
@@ -759,7 +759,7 @@ static void at_connect_notice_cb(struct at_socket *sock, at_socket_evt_t event,
     }
     new_sock = at_get_socket(new_socket);
     new_sock->state = AT_SOCKET_CONNECT;
-    sscanf(buff, "SOCKET:%d", &base_socket);
+    rt_sscanf(buff, "SOCKET:%d", &base_socket);
     LOG_D("ACCEPT BASE SOCKET: %d", base_socket);
     new_sock->user_data = (void *)base_socket;
 
@@ -985,7 +985,7 @@ int at_accept(int socket, struct sockaddr *name, socklen_t *namelen)
         at_do_event_changes(sock, AT_EVENT_RECV, RT_FALSE);
     }
 
-    sscanf(&receive_buff[0], "SOCKET:%d", &new_socket);
+    rt_sscanf(&receive_buff[0], "SOCKET:%d", &new_socket);
     new_sock = at_get_socket(new_socket);
     ip4_addr_set_any(&remote_addr);
     ipaddr_port_to_socketaddr(name, &remote_addr, &remote_port);
diff --git a/examples/test/avl.c b/examples/test/avl.c
index 961b46cc3ca..b5141c5d9d3 100644
--- a/examples/test/avl.c
+++ b/examples/test/avl.c
@@ -556,7 +556,7 @@ int main(int argc, char *argv[])
 {
     if (argc == 2)
     {
-        sscanf(argv[1], "%d", &loop_count);
+        rt_sscanf(argv[1], "%d", &loop_count);
     }
     else
     {