diff --git a/Cargo.toml b/Cargo.toml
index 120671fca77d6ad256302a4c0469dc7a14fc4b9c..3ee2f02a6f9415bcb6ec468cfc362f524a71456c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ version = "0.1.0"
 crate-type = ["rlib"]
 
 [features]
-default = ["liteos"]
+default = []
 liteos = []
 
 [dependencies]
diff --git a/examples/test_liteos.rs b/examples/test_liteos.rs
index 05effcee7495f9900fb8debe30eaf8b6bfde5ea5..80daa2093e6184d30b430cd8afbce919969d4eff 100644
--- a/examples/test_liteos.rs
+++ b/examples/test_liteos.rs
@@ -6,12 +6,7 @@
 #![feature(bench_black_box)]
 #![feature(box_syntax)]
 
-use core::alloc::Layout;
-
-use alloc::{
-    alloc::{alloc, dealloc},
-    string::ToString,
-};
+use alloc::string::ToString;
 use arch::os::printf;
 
 #[allow(unused_imports)]
@@ -58,4 +53,3 @@ unsafe extern "C" fn app_init() {
     printf("RWLock frob Test\n\0".as_ptr());
     frob();
 }
-
diff --git a/src/liteos/os.rs b/src/liteos/os.rs
index d84a2e4dfc5a09505e04bbd109e4b405cb2837d8..71a734296cad88169eaaa7849067e8fff8dd249a 100644
--- a/src/liteos/os.rs
+++ b/src/liteos/os.rs
@@ -1,22 +1,15 @@
 // Copyright (C) 2022-2022 Agilor Co.,Ltd.   All rights reserved.
 // SPDX-License-Identifier: Apache-2.0
-use core::{alloc::Layout, mem::MaybeUninit, str::from_utf8_unchecked};
+use core::str::from_utf8_unchecked;
 
-use crate::thread::Thread;
-
-use super::libc;
-use super::libc::timer::LOS_TickCountGet;
-
-use super::{
-    libc::c::strnlen,
-    libc::sys::{self, __errno_location, strerror_r},
-    sysinfo::LOSCFG_BASE_CORE_TICK_PER_SECOND,
-};
-use alloc::{
-    alloc::alloc,
-    boxed::Box,
-    string::{String, ToString},
+use super::libc::{
+    self,
+    c::strnlen,
+    sys::{self, __errno_location, strerror_r},
+    timer::LOS_TickCountGet,
 };
+use super::sysinfo::LOSCFG_BASE_CORE_TICK_PER_SECOND;
+use alloc::string::{String, ToString};
 #[inline(always)]
 pub fn errno() -> i32 {
     unsafe { *__errno_location() as i32 }
diff --git a/src/liteos/rust.c b/src/liteos/rust.c
index 29587b9d89fda0d6cdbe0a5df3834f9333bf7d40..111c0a9cdce83e500ce59bbdff4bd31effb51aca 100644
--- a/src/liteos/rust.c
+++ b/src/liteos/rust.c
@@ -1,3 +1,5 @@
+// Copyright (C) 2022-2022 Agilor Co.,Ltd.   All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
 #include "los_spinlock.h"
 #include "los_task_pri.h"
 #include "los_atomic.h"