diff --git a/llvm-build/README.md b/llvm-build/README.md
index ed9545bcb2512e091aeb90fdc54a24deca7d4292..5f1e0f84c14ce216799028f3bd79957373d16f83 100644
--- a/llvm-build/README.md
+++ b/llvm-build/README.md
@@ -20,7 +20,7 @@ MacOS X >= 10.15.4
ubuntu
```
-sudo apt-get install build-essential swig python3-dev libedit-dev libncurses5-dev binutils-dev gcc-multilib abigail-tools elfutils pkg-config autoconf autoconf-archive
+sudo apt-get install build-essential swig python3-dev libedit-dev libncurses5-dev binutils-dev gcc-multilib abigail-tools elfutils pkg-config autoconf autoconf-archive libxml2
```
mac
```
@@ -43,188 +43,19 @@ Here is an example of starting build process on Linux or MacOS:
```
# update prebuilts, no need to run each time
./toolchain/llvm-project/llvm-build/env_prepare.sh
+#change llvm-project
+cd ./toolchain/llvm-project
+git remote update
+git checkout origin/llvm-18.1.8
# build
-python3 ./toolchain/llvm-project/llvm-build/build.py
+bash ./toolchain/llvm-project/llvm-build/build.sh
```
-1. env_prepare (one time only)
-
-
-2. build
-
-
-
-
-### Options
-
-build.py options：
-
-```
---skip-build # skip compile and goto package step
---skip-package # do compile without package step
---enable-assertions # enable assertion when compiling
---build-name # specify release package name
---debug # build debug version llvm toolchain
---target-debug # build debug version of target llvm libraries, runtimes, and lldb-server
---strip # strip llvm toolchain binaries
---no-strip-libs # used with -- strip to preserve the symbols of the lib library
---no-build-arm # skip triplet arm
---no-build-aarch64 # skip triplet arm64
---no-build-x86_64 # skip triplet x86_64
---no-lto # disable LTO optimization when build toolchain
---build-instrumented # enable instrument pgo when build toolchain
---xunit-xml-output # specify LLVM unit test XML report path
---build-lldb-static # build statically lldb tool for ARM and AARCH64
---build-python # build python (not using prebuilt one, currently effective for Windows and OHOS)
---build-ncurses # build ncurses tool for linux, Mac x86-64 or M1
---build-libedit # build libedit tool for linux, Mac x86-64 or M1
---build-libxml2 # build libxml2 tool for linux, windows, Mac x86_64 or M1
---lldb-timeout # automatically exit when timeout (currently effective for lldb-server)
---no-build # optional, skip some targets
- windows
- libs
- lldb-server
- linux
- check-api
---build-clean # delete out folder after build packages
---build_libs_flags # which kind of flags for build_crts and build_runtimes
- OH
- LLVM
- BOTH
---build-only # build only some targets, skip building windows, lldb-server and package step
- lld
- llvm-readelf
- llvm-objdump
- musl
- compiler-rt
- libcxx
---enable-check-abi # Check libc++_shared.so ABI. If the ABI was changed then interrupt a build process and report an error.
-```
-
-
-### Output Layout
-
-When build successfully completed. following artifacts will be available in `out` directory
-
-`sysroot` -> sysroots for OHOS targets
-`install` -> toolchain build
-`*.tar.bz2` -> archived versions of toolchain and sysroots
-
-
-### OHOS Archive
-
-1. llvm
-```
-contains:
-1. toolchain which provides clang compiler, lldb(-mi), clang-tidy etc. tools
-2. libc++/clang_rt/asan/fuzzer libs for target device
-
-OHOS sync from: https://mirrors.huaweicloud.com/openharmony/compiler/clang/
-Which is the same as: out/clang-dev-${platform}-${arch}.tar.bz2
-OHOS archive to: prebuilts/clang/ohos//${platform}/llvm
-
-License: Apache License v2.0 with LLVM Exceptions
-```
-
-2. libcxx-ndk
-```
-contains: provide libc++ for ndk in target device
-
-OHOS fetch prebuilts from: https://mirrors.huaweicloud.com/openharmony/compiler/clang/ and archive it to prebuilts/clang/ohos//${platform}/libcxx-ndk. This tar is
-
-License: Apache License v2.0 with LLVM Exceptions
-```
-
-### Build process of AArch64 toolchain
-
-First build toolchain on Linux.
-Here is an example of starting build process on Linux:
-```
-# build
-python3 ./toolchain/llvm-project/llvm-build/build-ohos-aarch64.py
-```
-
-
-
-build-ohos-aarch64.py options：
-
-```
---enable-assertions # enable assertion when compiling
---debug # build debug version llvm toolchain
---strip # strip llvm toolchain binaries
---build-python # build python and enable script in debugger
---build-ncurses # build ncurses and enable ncurses in debugger
---build-libedit # build libedit and enable libedit in debugger
---build-libxml2 # build libxml2 and enable libxml in debugger
-```
-
-
-When build successfully completed, artifacts will be available in `out/ohos-aarch64-install` directory, including clang, lld, runtimes, LLVM tools and libLLVM.so for aarch64.
-
-
-## Function Introduction
-
-
-### Build process of Arm debugger
-
-First build toolchain on Linux.
-Here is an example of starting build process on Linux:
-```
-# build
-python3 ./toolchain/llvm-project/llvm-build/build-ohos-arm.py
-```
-
-
-
-build-ohos-arm.py options：
-
-```
---build-python # build python and enable script in debugger
---build-ncurses # build ncurses and enable ncurses in debugger
---build-libedit # build libedit and enable libedit in debugger
---build-libxml2 # build libxml2 and enable libxml in debugger
-```
-
-
-When build successfully completed, artifacts will be available in `out/ohos-arm-install` directory, including lldb for arm.
-
-
-## Function Introduction
-
-
-### Build process of AArch64 toolchain for Ubuntu (aarch64-linux-gnu triple)
-
-First build toolchain on Linux.
-Install additional package libstdc++-11-dev-arm64-cross.
-
-Here is an example of starting build process on Linux:
-```
-# build
-python3 ./toolchain/llvm-project/llvm-build/build-linux-aarch64.py
-```
-
-
-
-build-linux-aarch64.py options：
-
-```
---enable-assertions # enable assertion when compiling
---debug # build debug version llvm toolchain
---strip # strip llvm toolchain binaries
---build-python # build python and enable script in debugger
---build-ncurses # build ncurses and enable ncurses in debugger
---build-libedit # build libedit and enable libedit in debugger
---build-libxml2 # build libxml2 and enable libxml in debugger
-```
-
-
-When build successfully completed, artifacts will be available in `out/linux-aarch64-install` directory, including clang, lld, runtimes, LLVM tools and libLLVM.so for aarch64.
-
### Functionality
-The LLVM toolchain is built based on LLVM 15.0.4. It is used to provide capability of building ohos image. For detailed information about LLVM 15.0.4, please refer to [LLVM 15.0.4](https://discourse.llvm.org/t/llvm-15-0-4-released/66337).
+The LLVM toolchain is built based on LLVM 18.1.8. It is used to provide capability of building ohos image. For detailed information about LLVM 18.1.8, please refer to [LLVM 18.1.8](https://discourse.llvm.org/t/18-1-8-released/79725).
### Specifically Included Triplets