diff --git a/mkrtos_knl/inc/knl/task.h b/mkrtos_knl/inc/knl/task.h
index 95d43fec3..0ff8c86d3 100755
--- a/mkrtos_knl/inc/knl/task.h
+++ b/mkrtos_knl/inc/knl/task.h
@@ -27,3 +27,4 @@ void task_init(task_t *task, ram_limit_t *ram, int is_knl);
 task_t *task_create(ram_limit_t *lim, int is_knl);
 int task_alloc_base_ram(task_t *tk, ram_limit_t *lim, size_t size);
 void task_kill(task_t *tk);
+int task_set_pid(task_t *task, pid_t pid);
diff --git a/mkrtos_knl/knl/task.c b/mkrtos_knl/knl/task.c
index 63b3aa538..c9c0f3c7f 100755
--- a/mkrtos_knl/knl/task.c
+++ b/mkrtos_knl/knl/task.c
@@ -104,6 +104,20 @@ static int task_lock_2(spinlock_t *sp0, spinlock_t *sp1, int *st0, int *st1)
     }
     return TRUE;
 }
+int task_set_pid(task_t *task, pid_t pid)
+{
+    task_t *cur_task = thread_get_current_task();
+
+    if (cur_task->pid == 0)
+    {
+        task->pid = pid;
+        return 0;
+    }
+    else
+    {
+        return -EACCES;
+    }
+}
 static void task_syscall_func(kobject_t *kobj, syscall_prot_t sys_p, msg_tag_t in_tag, entry_frame_t *f)
 {
     task_t *cur_task = thread_get_current_task();
@@ -186,15 +200,7 @@ static void task_syscall_func(kobject_t *kobj, syscall_prot_t sys_p, msg_tag_t i
     break;
     case TASK_SET_PID:
     {
-        if (tag_task->pid == (pid_t)(-1))
-        {
-            tag_task->pid = f->r[0];
-            tag = msg_tag_init4(0, 0, 0, 0);
-        }
-        else
-        {
-            tag = msg_tag_init4(0, 0, 0, -EACCES);
-        }
+        tag = msg_tag_init4(0, 0, 0, task_set_pid(tag_task, f->r[0]));
     }
     break;
     case TASK_GET_PID:
diff --git a/mkrtos_knl/knl/thread_knl.c b/mkrtos_knl/knl/thread_knl.c
index 9af40c078..aa85442c7 100755
--- a/mkrtos_knl/knl/thread_knl.c
+++ b/mkrtos_knl/knl/thread_knl.c
@@ -70,6 +70,7 @@ static void knl_init_2(void)
     void *sp_addr = (char *)init_task->mm_space.mm_block + app->i.stack_offset - app->i.data_offset;
     void *sp_addr_top = (char *)sp_addr + app->i.stack_size;
 
+    task_set_pid(&init_task, 0);
     thread_set_msg_bug(init_thread, (char *)(init_task->mm_space.mm_block) + app->i.ram_size);
     thread_bind(init_thread, &init_task->kobj);
     thread_user_pf_set(init_thread, (void *)(KNL_TEXT + INIT_OFFSET), (void *)((umword_t)sp_addr_top - 8),
diff --git a/mkrtos_user/server/init/src/main.c b/mkrtos_user/server/init/src/main.c
index 6e5f2e2e1..105f64414 100644
--- a/mkrtos_user/server/init/src/main.c
+++ b/mkrtos_user/server/init/src/main.c
@@ -61,7 +61,6 @@ int main(int argc, char *args[])
 
     ulog_write_str(LOG_PROT, "init..\n");
     test();
-    task_set_pid(TASK_THIS, 0);
     env = u_get_global_env();
     rpc_meta_init(THREAD_MAIN, &env->ns_hd);
     namespace_init();