diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..8809905
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,48 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  clippy:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        rust-toolchain: [nightly]
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dtolnay/rust-toolchain@nightly
+      with:
+        toolchain: ${{ matrix.rust-toolchain }}
+        components: rust-src, clippy, rustfmt
+    - name: Setup ArceOS
+      run: ./scripts/get_deps.sh
+    - name: Check rust version
+      run: rustc --version --verbose
+    - name: Check code format
+      run: cargo fmt -- --check
+    - name: Clippy
+      run: cargo clippy
+    - name: Build for rust-std
+      run: cargo build
+
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        arch: [x86_64, riscv64, aarch64]
+        rust-toolchain: [nightly]
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dtolnay/rust-toolchain@stable
+      with:
+        toolchain: ${{ matrix.rust-toolchain }}
+        components: rust-src, llvm-tools
+        targets: x86_64-unknown-none, riscv64gc-unknown-none-elf, aarch64-unknown-none, aarch64-unknown-none-softfloat
+    - uses: Swatinem/rust-cache@v2
+    - run: cargo install cargo-binutils
+    - run: ./scripts/get_deps.sh
+    - name: Build for ${{ matrix.arch }}
+      run: make ARCH=${{ matrix.arch }}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..88d381e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+/target
+/.vscode
+/.arceos
+/.cargo
+.DS_Store
+Cargo.lock
+*.elf
+*.bin
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..606a43c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "arceos-helloworld"
+version = "0.1.0"
+edition = "2021"
+authors = ["Yuekai Jia <equation618@gmail.com>"]
+homepage = "https://github.com/arceos-org/arceos"
+repository = "https://github.com/arceos-org/app-helloworld"
+
+[dependencies]
+axstd = { git = "https://github.com/arceos-org/arceos.git", optional = true }
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..d1e6250
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+AX_ROOT ?= $(PWD)/.arceos
+
+all: build
+
+ax_root:
+	@./scripts/set_ax_root.sh $(AX_ROOT)
+
+build run justrun debug fmt disasm clean: ax_root
+	@make -C $(AX_ROOT) A=$(PWD) $@
+
+.PHONY: all ax_root build run justrun debug fmt disasm clean
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..01d01c8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,44 @@
+# app-helloworld
+
+[![CI](https://github.com/arceos-org/app-helloworld/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/arceos-org/app-helloworld/actions/workflows/ci.yml)
+
+A "Hello, world!" application on [ArceOS](https://github.com/arceos-org/arceos).
+
+## Quick Start
+
+### 1. Install Build Dependencies
+
+Install [cargo-binutils](https://github.com/rust-embedded/cargo-binutils) to use `rust-objcopy` and `rust-objdump` tools:
+
+```bash
+cargo install cargo-binutils
+```
+
+Download ArceOS source code:
+
+```bash
+./scripts/get_deps.sh
+```
+
+The ArceOS repository will be cloned into `.arceos`.
+You can also skip this step by specifying the `AX_ROOT` parameter when running the `make` command.
+
+### 2. Build & Run
+
+```bash
+make ARCH=<arch> LOG=<log> run
+```
+
+Where `<arch>` should be one of `riscv64`, `aarch64`，`x86_64`.
+
+`<log>` should be one of `off`, `error`, `warn`, `info`, `debug`, `trace`.
+
+Other arguments are the same as ArceOS's [Makefile](https://github.com/arceos-org/arceos/blob/main/Makefile).
+
+For example, to run on `qemu-system-aarch64` with 4 cores and log level `info`:
+
+```bash
+make ARCH=aarch64 LOG=info SMP=4 run
+```
+
+[![Run app-helloworld on ArceOS](img/demo.gif)](https://asciinema.org/a/669147?autoplay=1)
diff --git a/img/demo.gif b/img/demo.gif
new file mode 100644
index 0000000..64cb207
Binary files /dev/null and b/img/demo.gif differ
diff --git a/scripts/config.toml.temp b/scripts/config.toml.temp
new file mode 100644
index 0000000..b152826
--- /dev/null
+++ b/scripts/config.toml.temp
@@ -0,0 +1,2 @@
+[patch.'https://github.com/arceos-org/arceos.git']
+axstd = { path = "%AX_ROOT%/ulib/axstd" }
diff --git a/scripts/get_deps.sh b/scripts/get_deps.sh
new file mode 100755
index 0000000..4c5a8bd
--- /dev/null
+++ b/scripts/get_deps.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+AX_ROOT=.arceos
+
+test ! -d "$AX_ROOT" && echo "Cloning repositories ..." || true
+test ! -d "$AX_ROOT" && git clone https://github.com/arceos-org/arceos .arceos || true
diff --git a/scripts/set_ax_root.sh b/scripts/set_ax_root.sh
new file mode 100755
index 0000000..a9f65db
--- /dev/null
+++ b/scripts/set_ax_root.sh
@@ -0,0 +1,13 @@
+#/bin/bash
+
+if [ "$#" -ne 1 ]; then
+    echo "Usage: $0 <AX_ROOT>"
+    exit 1
+fi
+
+AX_ROOT=$1
+
+mkdir -p .cargo
+sed -e "s|%AX_ROOT%|$AX_ROOT|g" scripts/config.toml.temp > .cargo/config.toml
+
+echo "Set AX_ROOT (ArceOS directory) to $AX_ROOT"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..97161c8
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,10 @@
+#![cfg_attr(feature = "axstd", no_std)]
+#![cfg_attr(feature = "axstd", no_main)]
+
+#[cfg(feature = "axstd")]
+use axstd::println;
+
+#[cfg_attr(feature = "axstd", no_mangle)]
+fn main() {
+    println!("Hello, world!");
+}