diff --git a/build/build_musl.sh b/build/build_musl.sh
deleted file mode 100755
index d8f38f775e2b1ce709c46cd509f13608820e5c7c..0000000000000000000000000000000000000000
--- a/build/build_musl.sh
+++ /dev/null
@@ -1,186 +0,0 @@
-#!/bin/bash
-
-#Copyright (c) 2020-2021 Huawei Device Co., Ltd.
-#Licensed under the Apache License, Version 2.0 (the "License");
-#you may not use this file except in compliance with the License.
-#You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-#Unless required by applicable law or agreed to in writing, software
-#distributed under the License is distributed on an "AS IS" BASIS,
-#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#See the License for the specific language governing permissions and
-#limitations under the License.
-
-set -e
-
-readonly MUSL_DIR="${PWD}/musl"
-readonly MUSL_CUR_DIR="./musl"
-readonly MUSL_DEBUG_DIR="${PWD}/musl_debug"
-readonly MUSL_DEBUG_CUR_DIR="./musl_debug"
-readonly MUSL_PATCH="${PWD}/musl-debug.patch"
-readonly MUSL_SOURCE="${PWD}/../../../../third_party/musl/*"
-readonly LITEOSTOPDIR="${PWD}/../../../../kernel/liteos_a"
-readonly PREFIX_M="${PWD}/../../../../kernel/liteos_m/kal/posix"
-readonly OPTIMIZE_DIR="${PWD}/optimized-routines"
-readonly OPTIMIZE_SOURCE="${PWD}/../../../../third_party/optimized-routines/*"
-
-BUILD=`gcc -dumpmachine`
-HOST=`gcc -dumpmachine`
-TARGET=arm-linux-ohoseabi
-CROSS_COMPILER=arm-linux-ohoseabi-
-CFLAGS_FOR_TARGET="-O2 -Wall -fstack-protector-strong -D_FORTIFY_SOURCE=2 -Wl,-z,relro,-z,now,-z,noexecstack -Wtrampolines"
-
-TARGET_LIBC_A="${PWD}/libc_opt.a"
-TARGET_LIBC_SO="${PWD}/libc_opt.so"
-
-PARALLEL=`grep ^processor /proc/cpuinfo|wc -l`
-LITEOS_COMPILER_PATH=`${LITEOSTOPDIR}/tools/build/mk/get_compiler_path.sh  ${CROSS_COMPILER} ${LITEOSTOPDIR}`
-
-export SYSROOT="${PWD}/../../../../prebuilts/gcc/linux-x86/arm/arm-linux-ohoseabi-gcc/target"
-export PATH="${LITEOS_COMPILER_PATH}/bin:${PATH}"
-
-# prepare to build musl
-if [ -d "${MUSL_DIR}" ]; then
-	rm -r ${MUSL_DIR}
-fi
-mkdir -p  ${MUSL_DIR}
-cp -r ${MUSL_SOURCE} ${MUSL_DIR}
-
-# prepare to build optimized-routines for improve musl performance
-if [ -d "${OPTIMIZE_DIR}" ]; then
-	rm -r ${OPTIMIZE_DIR}
-fi
-mkdir -p  ${OPTIMIZE_DIR}
-cp -r ${OPTIMIZE_SOURCE} ${OPTIMIZE_DIR}
-
-# build optimized-routines
-function build_opt()
-{
-	pushd ${OPTIMIZE_DIR}
-	# generate the config.mk file required for compiling the optimized-routines lib.
-	exec 3>&1 1>config.mk
-	cat << EOF
-# This version of config.mk was generated by:
-# build_musl.sh
-# The default configuration(CFLAGS) is from optimized-routines.
-# Any changes made here will be lost if build_musl.sh re-run
-
-# Target architecture: aarch64, arm or x86_64
-ARCH = arm
-
-# Subprojects to build
-SUBS = string
-
-# Use for cross compilation with gcc/clang.
-CROSS_COMPILE = ${CROSS_COMPILER}
-
-# Compiler for the target
-CC = ${LITEOS_COMPILER_PATH}/bin/${CROSS_COMPILER}gcc
-CFLAGS = -std=c99 -pipe -O3 -mfpu=neon-vfpv4 -mfloat-abi=softfp -march=armv7-a
-CFLAGS += -Wall -Wno-missing-braces
-
-# Enable debug info.
-#HOST_CFLAGS += -g
-#CFLAGS += -g
-
-# Use with gcc.
-CFLAGS += -frounding-math -fexcess-precision=standard -fno-stack-protector
-CFLAGS += -ffp-contract=fast -fno-math-errno
-
-EOF
-	exec 1>&3 3>&-
-	make -j
-	popd
-}
-
-# generate the final libc.so file.
-function install_opt_libc()
-{
-	if [ -e "${TARGET_LIBC_A}" ]; then
-		rm ${TARGET_LIBC_A}
-	fi
-	if [ -e "${TARGET_LIBC_SO}" ]; then
-		rm ${TARGET_LIBC_SO}
-	fi
-
-	# make libc_opt.a libc_opt.so by makefile
-	make musldir=$2 -j
-
-	# copy libc_opt.so libc_opt.a to a specified directory to replace the original libc.so libc.a file.
-	if [ -e "${TARGET_LIBC_A}" ] && [ -e "${TARGET_LIBC_SO}" ]; then
-		rm $1/lib/libc.a $1/lib/libc.so
-		cp ${TARGET_LIBC_A} $1/lib/libc.a
-		cp ${TARGET_LIBC_SO} $1/lib/libc.so
-	else
-		printf "build libc_opt error!"
-	fi
-}
-
-function install_debug_musl()
-{
-	mkdir -p  ${SYSROOT}/usr/include/debug
-	mkdir -p  ${MUSL_DIR}/lib/debug
-	cp -f ${MUSL_DEBUG_DIR}/include/debug.h ${SYSROOT}/usr/include/debug
-	cp -f ${MUSL_DEBUG_DIR}/lib/libc.* ${MUSL_DIR}/lib/debug
-}
-
-# build musl
-function build_musl()
-{
-	pushd $2
-	if [ "$2" = "${MUSL_DEBUG_DIR}" ]; then
-		patch -p1 < ${MUSL_PATCH}
-	fi
-	#CC="${LITEOS_COMPILER_PATH}/bin/${CROSS_COMPILER}gcc $1" ./configure  --with-headers=${SYSROOT}/usr/include  --build=${BUILD} --host=${TARGET}
-	CC="${LITEOS_COMPILER_PATH}/bin/${CROSS_COMPILER}gcc $1" ./configure --prefix=${SYSROOT}/ --with-headers=${SYSROOT}/usr/include --build=${BUILD} --host=${TARGET} --libdir=${SYSROOT}/usr/lib --includedir=${SYSROOT}/usr/include
-	#CC="${LITEOS_COMPILER_PATH}/bin/${CROSS_COMPILER}gcc $1 -mcpu=cortex-a7 -mfloat-abi=soft" ./configure --prefix=${SYSROOT}/ --with-heades=${SYSROOT}/usr/include --build=${BUILD} --host=${TARGET} --libdir=${SYSROOT}/usr/lib/a7_soft --includedir=${SYSROOT}/usr/include
-	#CC="${LITEOS_COMPILER_PATH}/bin/${CROSS_COMPILER}gcc $1 -mcpu=cortex-a7 -mfloat-abi=softfp -mfpu=neon-vfpv4" ./configure --prefix=${SYSROOT}/ --with-heades=${SYSROOT}/usr/include --build=${BUILD} --host=${TARGET} --libdir=${SYSROOT}/usr/lib/a7_soft --includedir=${SYSROOT}/usr/include
-	make -j ${PARALLEL} CROSS=${CROSS_COMPILER}
-	popd
-}
-
-# prepare linux compat headers for musl
-sh thirdparty_headers.sh ${MUSL_DIR}
-
-if [ $# -eq 1 -a "$1" = "-m" ]; then
-pushd ${MUSL_DIR}
-CC="${LITEOS_COMPILER_PATH}/bin/${CROSS_COMPILER}gcc ${CFLAGS_FOR_TARGET}" ./configure --with-headers=${SYSROOT}/usr/include  --build=${BUILD} --host=${TARGET} --prefix=${PREFIX_M}
-cp ${MUSL_DIR}/kernel_m/include/alltypes.h.in ${MUSL_DIR}/include/alltypes.h.in
-cp ${MUSL_DIR}/kernel_m/arch/arm/bits/alltypes.h.in ${MUSL_DIR}/arch/arm/bits/alltypes.h.in
-make -f - -j ${PARALLEL} CROSS=${CROSS_COMPILER} install-headers <<EOF
-include config.mak
-\$(DESTDIR)\$(includedir)/%: \$(srcdir)/kernel_m/include/%
-	\$(HIDE)\$(INSTALL) -D -m 644 \$< \$@
-include Makefile
-EOF
-popd
-else
-# build optimized-routines
-build_opt
-
-# build musl
-build_musl "${CFLAGS_FOR_TARGET}" "${MUSL_DIR}"
-# generate the final libc.so file.
-install_opt_libc "${MUSL_DIR}" "${MUSL_CUR_DIR}"
-
-# prepare for musl debug
-CFLAGS_DEBUG_FOR_TARGET=${CFLAGS_FOR_TARGET}" -funwind-tables -rdynamic"
-UNWIND_H="${PWD}/../../../../prebuilts/gcc/linux-x86/arm/arm-linux-ohoseabi-gcc/lib/gcc/arm-linux-musleabi/7.3.0/include/unwind*"
-if [ -d "${MUSL_DEBUG_DIR}" ]; then
-	rm -r ${MUSL_DEBUG_DIR}
-fi
-mkdir -p  ${MUSL_DEBUG_DIR}
-cp -r ${MUSL_SOURCE} ${MUSL_DEBUG_DIR}
-cp -f ${UNWIND_H} ${MUSL_DEBUG_DIR}/include
-# prepare linux compat headers for musl debug
-sh thirdparty_headers.sh ${MUSL_DEBUG_DIR}
-# build musl_debug
-build_musl "${CFLAGS_DEBUG_FOR_TARGET}" "${MUSL_DEBUG_DIR}"
-# generate the final libc.so file.
-install_opt_libc "${MUSL_DEBUG_DIR}" "${MUSL_DEBUG_CUR_DIR}"
-# generate final musl debug shared library
-install_debug_musl
-fi
-
diff --git a/build/linux_kernel_header_install.sh b/build/linux/linux_kernel_header_install.sh
similarity index 98%
rename from build/linux_kernel_header_install.sh
rename to build/linux/linux_kernel_header_install.sh
index a5ae59d29d9493ed14cfd0374c456433cd215e55..dcf96ce509a1a5b077e23ab2110fc2419e8505ff 100755
--- a/build/linux_kernel_header_install.sh
+++ b/build/linux/linux_kernel_header_install.sh
@@ -17,7 +17,7 @@
 
 set -e
 ARM_TYPE=arm
-PRJ_ROOT="$PWD/../../../../"
+PRJ_ROOT="$PWD/../../../../../"
 KERNEL_ROOT="$PRJ_ROOT/kernel/linux-4.19"
 ARM_HDR="$KERNEL_ROOT/hdr_install/${ARM_TYPE}_header"
 OUT_HDR="$PRJ_ROOT/prebuilts/lite/sysroot/thirdparty/linux_headers_install"
diff --git a/build/linux_kernel_thirdparty_headers.sh b/build/linux/linux_kernel_thirdparty_headers.sh
similarity index 100%
rename from build/linux_kernel_thirdparty_headers.sh
rename to build/linux/linux_kernel_thirdparty_headers.sh
diff --git a/build/Makefile b/build/liteos/Makefile
similarity index 100%
rename from build/Makefile
rename to build/liteos/Makefile
diff --git a/build/liteos/README.md b/build/liteos/README.md
new file mode 100755
index 0000000000000000000000000000000000000000..8f81d47af688f8c2c35af3595a25590a60dedfe7
--- /dev/null
+++ b/build/liteos/README.md
@@ -0,0 +1,14 @@
+To build toolchains, we follow the steps.
+
+1.linux headers install
+```
+./linux_header_install.sh
+```
+2.build musl
+```
+./build_musl_clang.sh
+```
+3.copy usr directory
+```
+cp -rf usr/lib usr/include ../../usr/
+```
diff --git a/build/build_musl_clang.sh b/build/liteos/build_musl_clang.sh
similarity index 95%
rename from build/build_musl_clang.sh
rename to build/liteos/build_musl_clang.sh
index b96854f82244f3be3a1bcd2ae21886a9f7bbdcaa..eb0e9c186223203668ec93a956f87e39f51a0c1c 100755
--- a/build/build_musl_clang.sh
+++ b/build/liteos/build_musl_clang.sh
@@ -14,17 +14,17 @@
 #limitations under the License.
 
 set -e
-
+readonly PRJ_ROOT="$PWD/../../../../../"
 readonly MUSL_DIR="${PWD}/musl"
 readonly MUSL_CUR_DIR="./musl"
 readonly MUSL_DEBUG_DIR="${PWD}/musl_debug"
 readonly MUSL_DEBUG_CUR_DIR="./musl_debug"
 readonly MUSL_PATCH="${PWD}/musl-debug.patch"
 readonly SYSROOT_DEBUG="${PWD}/usr_debug"
-readonly MUSL_SOURCE="${PWD}/../../../../third_party/musl/*"
+readonly MUSL_SOURCE="${PRJ_ROOT}/third_party/musl/*"
 readonly OPTIMIZE_DIR="${PWD}/optimized-routines"
-readonly OPTIMIZE_SOURCE="${PWD}/../../../../third_party/optimized-routines/*"
-readonly LITEOSTOPDIR="${PWD}/../../../../kernel/liteos_a"
+readonly OPTIMIZE_SOURCE="${PRJ_ROOT}/third_party/optimized-routines/*"
+readonly LITEOSTOPDIR="${PRJ_ROOT}/kernel/liteos_a"
 readonly SYSROOT="${PWD}/usr"
 
 BUILD=`gcc -dumpmachine`
@@ -89,7 +89,7 @@ CROSS_COMPILE = ${CROSS_COMPILE}
 # Compiler for the target
 CC = ${LITEOS_COMPILER_PATH}/bin/clang
 CFLAGS = -std=c99 -pipe -O3 --target=arm-liteos -march=armv7-a -mfpu=neon-vfpv4 -mfloat-abi=softfp -nostdinc
-CFLAGS += -I/${SYSROOT}/../../usr/include/${TARGET}
+CFLAGS += -I/${SYSROOT}/../../../usr/include/${TARGET}
 CFLAGS += -Wall -Wno-missing-braces
 
 # Enable debug info.
@@ -98,7 +98,7 @@ CFLAGS += -Wall -Wno-missing-braces
 
 # Use with clang.
 CFLAGS += -ffp-contract=fast
-LDFLAGS = -L${LITEOS_COMPILER_PATH}/lib/clang/9.0.0/lib/${TARGET}/a7_softfp_neon-vfpv4 -L${SYSROOT}/../../usr/lib/${TARGET}/a7_softfp_neon-vfpv4 -lclang_rt.builtins -fuse-ld=lld -nostartfiles
+LDFLAGS = -L${LITEOS_COMPILER_PATH}/lib/clang/9.0.0/lib/${TARGET}/a7_softfp_neon-vfpv4 -L${SYSROOT}/../../../usr/lib/${TARGET}/a7_softfp_neon-vfpv4 -lclang_rt.builtins -fuse-ld=lld -nostartfiles
 
 EOF
     exec 1>&3 3>&-
diff --git a/build/linux_header_install.sh b/build/liteos/linux_header_install.sh
similarity index 97%
rename from build/linux_header_install.sh
rename to build/liteos/linux_header_install.sh
index ee3d3e7c0b290969bdc327cd92033b974c7da2ca..7b319a7c805fb5657ae0206d6bc15df731a4c4db 100755
--- a/build/linux_header_install.sh
+++ b/build/liteos/linux_header_install.sh
@@ -17,7 +17,7 @@
 
 set -e
 
-PRJ_ROOT="$PWD/../../../../"
+PRJ_ROOT="$PWD/../../../../../"
 KERNEL_ROOT="$PRJ_ROOT/third_party/Linux_Kernel"
 ARM_HDR="$PRJ_ROOT/third_party/Linux_Kernel/hdr_install/arm_header"
 OUT_HDR="$PRJ_ROOT/prebuilts/lite/sysroot/thirdparty/linux_headers_install"
diff --git a/build/mem_info_parse b/build/liteos/mem_info_parse
similarity index 100%
rename from build/mem_info_parse
rename to build/liteos/mem_info_parse
diff --git a/build/musl-debug.patch b/build/liteos/musl-debug.patch
similarity index 100%
rename from build/musl-debug.patch
rename to build/liteos/musl-debug.patch
diff --git a/build/thirdparty_headers.sh b/build/liteos/thirdparty_headers.sh
similarity index 95%
rename from build/thirdparty_headers.sh
rename to build/liteos/thirdparty_headers.sh
index c9abc0b01a196226f0a24c02a33c8af947589103..6c2ee30b454abcba4403ccea3f411b1cdfa9cfe8 100755
--- a/build/thirdparty_headers.sh
+++ b/build/liteos/thirdparty_headers.sh
@@ -17,7 +17,7 @@
 
 set -e
 
-PRJ_ROOT="${PWD}/../../../../"
+PRJ_ROOT="${PWD}/../../../../../"
 LINUX_HDR="${PRJ_ROOT}/prebuilts/lite/sysroot/thirdparty/linux_headers_install"
 TMP_DIR_ORI="${PRJ_ROOT}/prebuilts/lite/sysroot/ohos_tmp_ori"
 TMP_DIR="${PRJ_ROOT}/prebuilts/lite/sysroot/ohos_tmp"
@@ -58,7 +58,7 @@ echo "#define __user" >> ${TMP_DIR_ORI}/uapi/linux/compiler.h
 echo "#endif" >> ${TMP_DIR_ORI}/uapi/linux/compiler.h
 
 pushd ${PRJ_ROOT}
-python prebuilts/lite/sysroot/build/update_headers.py 2>/dev/null
+python prebuilts/lite/sysroot/build/liteos/update_headers.py 2>/dev/null
 popd
 
 cp -rf  ${TMP_DIR}/uapi/* ${MUSL_DIR}/
diff --git a/build/update_headers.py b/build/liteos/update_headers.py
similarity index 100%
rename from build/update_headers.py
rename to build/liteos/update_headers.py
diff --git a/usr/lib/arm-liteos/Scrt1.o b/usr/lib/arm-liteos/Scrt1.o
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diff --git a/usr/lib/arm-liteos/a7_softfp_neon-vfpv4/crt1.o b/usr/lib/arm-liteos/a7_softfp_neon-vfpv4/crt1.o
index 03f5a94537e83f2c0dcc56fc0f49bc7753f72927..ce6f5a5f99436f7217cf8c96e0645ada4b830640 100644
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