diff --git a/Ubiquitous/XiZi_AIoT/services/Makefile b/Ubiquitous/XiZi_AIoT/services/Makefile
index 10557717b..b3a5f2c41 100644
--- a/Ubiquitous/XiZi_AIoT/services/Makefile
+++ b/Ubiquitous/XiZi_AIoT/services/Makefile
@@ -1,5 +1,5 @@
 
-SRC_DIR := fs shell lib boards drivers semaphore drivers  tools net app 
+SRC_DIR := fs shell lib boards drivers semaphore drivers tools net app 
 
 
 include $(KERNEL_ROOT)/compiler.mk
diff --git a/Ubiquitous/XiZi_AIoT/services/app/Makefile b/Ubiquitous/XiZi_AIoT/services/app/Makefile
index 113508502..471b366f6 100644
--- a/Ubiquitous/XiZi_AIoT/services/app/Makefile
+++ b/Ubiquitous/XiZi_AIoT/services/app/Makefile
@@ -43,7 +43,7 @@ INC_DIR = 	-I$(KERNEL_ROOT)/services/shell/letter-shell \
 			-I$(KERNEL_ROOT)/services/app 
 
 ifeq ($(BOARD), imx6q-sabrelite)
-all: init test_fault simple_client simple_server shell fs_server semaphore_server test_semaphore test_ipc_null test_thread test_irq_hdlr test_irq_block test_irq_send eth_driver epit_server readme.txt | bin
+all: init test_fault simple_client simple_server shell fs_server semaphore_server test_semaphore test_ipc_null test_thread test_irq_hdlr test_irq_block test_irq_send eth_driver epit_server test_net lwip readme.txt | bin
 else 
 all: init test_fault simple_client simple_server shell fs_server test_ipc_null test_thread test_semaphore readme.txt | bin
 endif
diff --git a/Ubiquitous/XiZi_AIoT/services/app/test_net.c b/Ubiquitous/XiZi_AIoT/services/app/test_net.c
index 424948855..396d01948 100644
--- a/Ubiquitous/XiZi_AIoT/services/app/test_net.c
+++ b/Ubiquitous/XiZi_AIoT/services/app/test_net.c
@@ -18,7 +18,7 @@
 
 static char udp_ip_str[128] = {0};
 static uint16_t udp_socket_port = 8888;
-#define UDP_DEMO_SEND_TIMES      20
+#define UDP_DEMO_SEND_TIMES      3
 
 int main(int argc, char* argv[])
 {
diff --git a/Ubiquitous/XiZi_AIoT/services/net/net_server/arch/sys_arch.c b/Ubiquitous/XiZi_AIoT/services/net/net_server/arch/sys_arch.c
index 6578105d7..cbe3a3d65 100644
--- a/Ubiquitous/XiZi_AIoT/services/net/net_server/arch/sys_arch.c
+++ b/Ubiquitous/XiZi_AIoT/services/net/net_server/arch/sys_arch.c
@@ -34,8 +34,6 @@
 
 #define SYS_THREAD_MAX 4
 
-static char sem_server_name[] = "DefaultSemaphoreServer";
-
 void sys_init(void)
 {
     // do nothing
@@ -65,9 +63,8 @@ void sys_arch_unprotect(sys_prot_t pval)
 
 err_t sys_sem_new(sys_sem_t* sem, u8_t count)
 {
-    connect_session(&sem->sess, sem_server_name, 4096);
-    sem_create(&sem->sess, &sem->sem, (int)count);
-
+    
+    *sem = semaphore_new(count);
     #if SYS_STATS
     ++lwip_stats.sys.sem.used;
     if (lwip_stats.sys.sem.max < lwip_stats.sys.sem.used) {
@@ -75,7 +72,7 @@ err_t sys_sem_new(sys_sem_t* sem, u8_t count)
     }
 #endif /* SYS_STATS */
 
-    if (sem->sem >= 0)
+    if (*sem > 0)
         return ERR_OK;
     else {
 #if SYS_STATS
@@ -91,36 +88,33 @@ void sys_sem_free(sys_sem_t* sem)
 #if SYS_STATS
     --lwip_stats.sys.sem.used;
 #endif /* SYS_STATS */
-    sem_delete(&sem->sess, &sem->sem); 
-    free_session(&sem->sess);
-    free(sem);
-    sem = SYS_SEM_NULL;
+    semaphore_free(*sem);
 }
 
 int sys_sem_valid(sys_sem_t* sem)
 {
-    return (sem->sem >= 0);
+    return (*sem > 0);
 }
 
 void sys_sem_set_invalid(sys_sem_t* sem)
 {
-    sem->sem = -1;
+    *sem = -1;
 }
 
 u32_t sys_arch_sem_wait(sys_sem_t* sem, u32_t timeout)
 {
     s32_t wait_time = 0;
 
-    if (sem->sem < 0)
+    if (*sem <= 0)
         return SYS_ARCH_TIMEOUT;
 
-    sem_wait(&sem->sess, &sem->sem, 0);
+    semaphore_wait(*sem);
     return 0;
 }
 
 void sys_sem_signal(sys_sem_t* sem)
 {
-    sem_signal(&sem->sess, &sem->sem);
+    semaphore_signal(*sem);
 }
 
 err_t sys_mutex_new(sys_mutex_t* mutex)
@@ -163,6 +157,7 @@ err_t sys_mbox_new(sys_mbox_t* mbox, int size)
     sys_sem_new(&mbox->not_full, 0);
     sys_sem_new(&mbox->mutex, 1);
     mbox->wait_send = 0;
+    mbox->valid = 1;
 
 #if SYS_STATS
     ++lwip_stats.sys.mbox.used;
@@ -181,23 +176,22 @@ err_t sys_mbox_new(sys_mbox_t* mbox, int size)
 void sys_mbox_free(sys_mbox_t* mbox)
 {
     if (mbox != SYS_MBOX_NULL){
-        // sys_arch_sem_wait(&mbox->mutex, 0);
-        // sys_sem_free(&mbox->not_empty);
-        // sys_sem_free(&mbox->not_full);
-        // sys_sem_free(&mbox->mutex);
+        sys_arch_sem_wait(&mbox->mutex, 0);
+        sys_sem_free(&mbox->not_empty);
+        sys_sem_free(&mbox->not_full);
+        sys_sem_free(&mbox->mutex);
         free(mbox);
-        mbox = NULL;
     }
 }
 
 int sys_mbox_valid(sys_mbox_t* mbox)
 {
-    return (mbox != SYS_MBOX_NULL);
+    return (mbox->valid == 1);
 }
 
 void sys_mbox_set_invalid(sys_mbox_t* mbox)
 {
-    mbox = SYS_MBOX_NULL;
+    mbox->valid = 0;
 }
 
 void sys_mbox_post(sys_mbox_t* q, void* msg)
diff --git a/Ubiquitous/XiZi_AIoT/services/net/net_server/arch/sys_arch.h b/Ubiquitous/XiZi_AIoT/services/net/net_server/arch/sys_arch.h
index e02c42359..2159f2767 100644
--- a/Ubiquitous/XiZi_AIoT/services/net/net_server/arch/sys_arch.h
+++ b/Ubiquitous/XiZi_AIoT/services/net/net_server/arch/sys_arch.h
@@ -39,22 +39,19 @@
 #define SYS_MRTEX_NULL SYS_SEM_NULL
 #define SYS_MBOX_SIZE 128
 
-struct sys_sem
-{
-    sem_t sem;
-    struct Session sess;
-};
-typedef struct sys_sem sys_sem_t;
-typedef struct sys_sem sys_mutex_t;
+
+typedef int sys_sem_t;
+typedef int sys_mutex_t;
 
 
 struct sys_mbox{
     int first, last;
     void *msgs[SYS_MBOX_SIZE];
-    struct sys_sem not_empty;
-    struct sys_sem not_full;
-    struct sys_sem mutex;
+    int not_empty;
+    int not_full;
+    int mutex;
     int wait_send;
+    int valid;
 };
 typedef struct sys_mbox sys_mbox_t;
 
diff --git a/Ubiquitous/XiZi_AIoT/softkernel/task/semaphore.c b/Ubiquitous/XiZi_AIoT/softkernel/task/semaphore.c
index 575e1aa7d..f1c5b5443 100644
--- a/Ubiquitous/XiZi_AIoT/softkernel/task/semaphore.c
+++ b/Ubiquitous/XiZi_AIoT/softkernel/task/semaphore.c
@@ -35,10 +35,10 @@ static inline struct ksemaphore* ksemaphore_get_by_id(struct XiziSemaphorePool*
     DOUBLE_LIST_FOR_EACH_ENTRY(sem, &sem_pool->sem_list_guard, sem_list_node)
     {
         if (sem->id == sem_id) {
-            break;
+            return sem;
         }
     }
-    return sem;
+    return NULL;
 }
 
 int ksemaphore_alloc(struct XiziSemaphorePool* sem_pool, int val)
@@ -102,8 +102,9 @@ bool ksemaphore_signal(struct XiziSemaphorePool* sem_pool, uint32_t sem_id)
 
     if (sem->val < 0) {
         if (!IS_DOUBLE_LIST_EMPTY(&sem->wait_list_guard)) {
-            assert(sem->wait_list_guard.next != NULL);
-            xizi_task_manager.task_unblock(CONTAINER_OF(sem->wait_list_guard.next, struct Thread, node));
+            struct Thread* thd = CONTAINER_OF(sem->wait_list_guard.next, struct Thread, node);
+            assert(thd != NULL && thd->state == BLOCKED);
+            xizi_task_manager.task_unblock(thd);
         }
     }