diff --git a/examples/ble/ble_central/ble_central_tp_client.c b/examples/ble/ble_central/ble_central_tp_client.c
index af3cc98d..238cc507 100644
--- a/examples/ble/ble_central/ble_central_tp_client.c
+++ b/examples/ble/ble_central/ble_central_tp_client.c
@@ -129,8 +129,6 @@ static void ble_subscribe()
         BT_WARN("Subscribed");
     }
 
-    k_sem_init(&write_data_poll_sem, 0, 1);
-
     if (!created_write_data_task && (xTaskCreate(ble_write_data_task, (char *)"ble_write_data", 512, NULL, 15, &ble_write_data_task_h) == pdPASS)) {
         created_write_data_task = 1;
         BT_WARN("Create write data  task success");
@@ -286,5 +284,6 @@ void ble_tp_init()
     if (!isRegister) {
         isRegister = 1;
         bt_conn_cb_register(&ble_tp_conn_callbacks);
+        k_sem_init(&write_data_poll_sem, 0, 1);
     }
 }
diff --git a/examples/ble/ble_peripheral/ble_peripheral_tp_server.c b/examples/ble/ble_peripheral/ble_peripheral_tp_server.c
index dffb4f58..4da20ca9 100644
--- a/examples/ble/ble_peripheral/ble_peripheral_tp_server.c
+++ b/examples/ble/ble_peripheral/ble_peripheral_tp_server.c
@@ -220,7 +220,6 @@ static void ble_tp_notify_ccc_changed(const struct bt_gatt_attr *attr, u16_t val
     BT_WARN("ccc:value=[%d]", value);
 
     if (value == BT_GATT_CCC_NOTIFY) {
-        k_sem_init(&notify_poll_sem, 0, 1);
 
         if (xTaskCreate(ble_tp_notify_task, (char *)"bletp", 512, NULL, 15, &ble_tp_task_h) == pdPASS) {
             created_tp_task = 1;
@@ -299,5 +298,6 @@ void ble_tp_init()
         isRegister = 1;
         bt_conn_cb_register(&ble_tp_conn_callbacks);
         bt_gatt_service_register(&ble_tp_server);
+        k_sem_init(&notify_poll_sem, 0, 1);
     }
 }