diff --git a/README.md b/README.md
index 1dac1eb..2c37934 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ jobs:
 
 | Name  | Type    | Default                  | Description                                                                                    |
 | ----- | ------- | ------------------------ | ---------------------------------------------------------------------------------------------- |
-| tag   | String  | 0.16.0-dev.312+164c598cd | zig version which will download from [zig-patch](https://github.com/openharmony-zig/zig-patch) |
+| tag   | String  | 0.16.0                   | zig version which will download from [zig-patch](https://github.com/openharmony-zig/zig-patch) |
 | cache | Boolean | true                     | Uses the GitHub actions cache to cache the SDK when enabled.                                   |
 
 ## Support Platforms
@@ -34,6 +34,12 @@ jobs:
 - [x] x86_64 window
 - [x] x86_64 linux for musl
 - [x] x86_64 linux for gnu
+- [x] aarch64 OpenHarmony
+- [x] armv7a OpenHarmony
+- [x] x86_64 OpenHarmony
+
+The installer prefers `.tar.xz` release assets and falls back to `.tar.gz` for
+older releases. It exits with an error when neither archive is available.
 
 ## License
 
diff --git a/action.yml b/action.yml
index d31092a..cb24cf4 100644
--- a/action.yml
+++ b/action.yml
@@ -4,7 +4,7 @@ inputs:
   tag:
     description: 'Zig OHOS release tag'
     required: false
-    default: '0.16.0-dev.312+164c598cd'
+    default: '0.16.0'
   cache:
     description: "Whether to cache the Zig installation or not"
     required: false
@@ -43,4 +43,4 @@ runs:
       env:
         INPUT_TAG: "${{ inputs.tag }}"
         INPUT_CACHE: "${{ inputs.cache }}"
-        INPUT_WAS_CACHED: "${{ steps.cache.outputs.cache-hit }}"
\ No newline at end of file
+        INPUT_WAS_CACHED: "${{ steps.cache.outputs.cache-hit }}"
diff --git a/install.sh b/install.sh
index d787ef1..4faff35 100755
--- a/install.sh
+++ b/install.sh
@@ -8,23 +8,43 @@ set -eux
 # Base URL for Zig OHOS releases
 URL_BASE="https://github.com/openharmony-zig/zig-patch/releases/download"
 
-# Determine platform and set OS_FILENAME
-if [[ "$OSTYPE" == "linux-musl"* ]]; then
-    OS_FILENAME="zig-x86_64-linux-musl-baseline.tar.gz"
+# Determine platform and set the archive basename
+if [[ "$OSTYPE" == "linux-ohos"* ]] || [[ "$OSTYPE" == "ohos"* ]]; then
+    case "$(uname -m)" in
+        aarch64|arm64)
+            OS_ARCHIVE_BASENAME="zig-aarch64-linux-ohos-baseline"
+            OS="ohos-arm64"
+            ;;
+        arm|armv7l|armeabi-v7a)
+            OS_ARCHIVE_BASENAME="zig-arm-linux-ohoseabi-generic+v7a"
+            OS="ohos-arm"
+            ;;
+        x86_64|amd64)
+            OS_ARCHIVE_BASENAME="zig-x86_64-linux-ohos-baseline"
+            OS="ohos-x86_64"
+            ;;
+        *)
+            echo "Error: Unsupported OpenHarmony architecture: $(uname -m)"
+            echo "Supported OpenHarmony architectures: aarch64, armv7a, x86_64"
+            exit 1
+            ;;
+    esac
+elif [[ "$OSTYPE" == "linux-musl"* ]]; then
+    OS_ARCHIVE_BASENAME="zig-x86_64-linux-musl-baseline"
     OS="linux-musl"
 elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
-    OS_FILENAME="zig-x86_64-linux-gnu-baseline.tar.gz"
+    OS_ARCHIVE_BASENAME="zig-x86_64-linux-gnu-baseline"
     OS="linux-gnu"
 elif [[ "$OSTYPE" == "darwin"* ]]; then
     if [[ $(uname -m) == 'arm64' ]]; then
-        OS_FILENAME="zig-aarch64-macos-none-baseline.tar.gz"
+        OS_ARCHIVE_BASENAME="zig-aarch64-macos-none-baseline"
         OS="macos-arm64"
     else
         echo "Error: Only ARM64 macOS is supported"
         exit 1
     fi
 elif [[ "$OSTYPE" == "cygwin" ]] || [[ "$OSTYPE" == "msys" ]] || [[ "$OSTYPE" == "win32" ]]; then
-    OS_FILENAME="zig-x86_64-windows-gnu-baseline.tar.gz"
+    OS_ARCHIVE_BASENAME="zig-x86_64-windows-gnu-baseline"
     OS="windows"
 else
     echo "Error: Unsupported OS type. Supported platforms:"
@@ -32,6 +52,9 @@ else
     echo "  - x86_64 Windows"
     echo "  - x86_64 Linux (musl)"
     echo "  - x86_64 Linux (gnu)"
+    echo "  - aarch64 OpenHarmony"
+    echo "  - armv7a OpenHarmony"
+    echo "  - x86_64 OpenHarmony"
     exit 1
 fi
 
@@ -105,8 +128,28 @@ fi
 # URL encode the tag for proper download URL
 ENCODED_TAG=$(echo "$INPUT_TAG" | sed 's/+/%2B/g')
 
-# Construct download URL
-DOWNLOAD_URL="${URL_BASE}/${ENCODED_TAG}/${OS_FILENAME}"
+# Prefer the xz archive, while retaining compatibility with older releases
+# that only provide a gz archive.
+XZ_DOWNLOAD_URL="${URL_BASE}/${ENCODED_TAG}/${OS_ARCHIVE_BASENAME}.tar.xz"
+GZ_DOWNLOAD_URL="${URL_BASE}/${ENCODED_TAG}/${OS_ARCHIVE_BASENAME}.tar.gz"
+
+archive_exists() {
+    curl -L --fail --silent --head --max-time 60 --output /dev/null "$1" 2>/dev/null
+}
+
+if archive_exists "$XZ_DOWNLOAD_URL"; then
+    DOWNLOAD_URL="$XZ_DOWNLOAD_URL"
+    ARCHIVE_FILE="zig-ohos.tar.xz"
+elif archive_exists "$GZ_DOWNLOAD_URL"; then
+    DOWNLOAD_URL="$GZ_DOWNLOAD_URL"
+    ARCHIVE_FILE="zig-ohos.tar.gz"
+else
+    echo "Error: No Zig OHOS archive found for ${OS} at tag ${INPUT_TAG}"
+    echo "Checked:"
+    echo "  - ${XZ_DOWNLOAD_URL}"
+    echo "  - ${GZ_DOWNLOAD_URL}"
+    exit 1
+fi
 
 echo "Downloading Zig OHOS from ${DOWNLOAD_URL}"
 
@@ -115,7 +158,7 @@ RETRY_COUNT=0
 MAX_RETRIES=3
 
 while [[ $RETRY_COUNT -lt $MAX_RETRIES ]]; do
-    if curl -L --fail --show-error --silent --max-time 300 -o "zig-ohos.tar.gz" "$DOWNLOAD_URL"; then
+    if curl -L --fail --show-error --silent --max-time 300 -o "$ARCHIVE_FILE" "$DOWNLOAD_URL"; then
         echo "Download completed successfully"
         break
     else
@@ -133,14 +176,14 @@ while [[ $RETRY_COUNT -lt $MAX_RETRIES ]]; do
 done
 
 # Verify download
-if [[ ! -f "zig-ohos.tar.gz" ]] || [[ ! -s "zig-ohos.tar.gz" ]]; then
+if [[ ! -f "$ARCHIVE_FILE" ]] || [[ ! -s "$ARCHIVE_FILE" ]]; then
     echo "Error: Downloaded file is missing or empty"
     exit 1
 fi
 
 # Extract the archive
 echo "Extracting Zig OHOS..."
-tar -xf "zig-ohos.tar.gz"
+tar -xf "$ARCHIVE_FILE"
 
 # Find the extracted directory (should start with 'zig-')
 ZIG_EXTRACTED_DIR=$(find . -maxdepth 1 -name "zig-*" -type d | head -n 1)
@@ -148,7 +191,7 @@ ZIG_EXTRACTED_DIR=$(find . -maxdepth 1 -name "zig-*" -type d | head -n 1)
 if [[ -z "$ZIG_EXTRACTED_DIR" ]]; then
     echo "Error: Could not find extracted Zig directory"
     echo "Archive contents:"
-    tar -tzf "zig-ohos.tar.gz" | head -10
+    tar -tf "$ARCHIVE_FILE" | head -10
     exit 1
 fi
 
@@ -166,7 +209,7 @@ else
 fi
 
 # Clean up the archive
-rm "zig-ohos.tar.gz"
+rm "$ARCHIVE_FILE"
 
 # Make sure the executable is executable (for Unix-like systems)
 if [[ "$OS" != "windows" ]]; then
diff --git a/tests/install.bash b/tests/install.bash
new file mode 100755
index 0000000..2232f65
--- /dev/null
+++ b/tests/install.bash
@@ -0,0 +1,103 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+export LC_ALL=C
+
+ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
+MOCK_BIN="${ROOT_DIR}/tests/mocks"
+TEST_DIR=$(mktemp -d "${TMPDIR:-/tmp}/setup-zig-ohos-tests.XXXXXX")
+trap 'rm -rf "$TEST_DIR"' EXIT
+
+mkdir -p "$TEST_DIR/fixtures/zig-fixture"
+printf '#!/usr/bin/env bash\necho 0.16.0-test\n' > "$TEST_DIR/fixtures/zig-fixture/zig"
+chmod +x "$TEST_DIR/fixtures/zig-fixture/zig"
+tar -C "$TEST_DIR/fixtures" -cJf "$TEST_DIR/fixtures/zig.tar.xz" zig-fixture
+tar -C "$TEST_DIR/fixtures" -czf "$TEST_DIR/fixtures/zig.tar.gz" zig-fixture
+
+assert_contains() {
+    local file="$1"
+    local expected="$2"
+
+    if ! grep -Fq "$expected" "$file"; then
+        echo "Expected to find '$expected' in $file" >&2
+        sed -n '1,200p' "$file" >&2
+        exit 1
+    fi
+}
+
+run_success_case() {
+    local name="$1"
+    local architecture="$2"
+    local available="$3"
+    local expected_archive="$4"
+    local expected_platform="$5"
+    local case_dir="$TEST_DIR/$name"
+
+    mkdir -p "$case_dir/home"
+    : > "$case_dir/github-path"
+    : > "$case_dir/github-output"
+    : > "$case_dir/curl.log"
+
+    env \
+        PATH="$MOCK_BIN:$PATH" \
+        HOME="$case_dir/home" \
+        OSTYPE="linux-ohos" \
+        INPUT_TAG="test+tag" \
+        INPUT_CACHE="false" \
+        INPUT_WAS_CACHED="false" \
+        GITHUB_PATH="$case_dir/github-path" \
+        GITHUB_OUTPUT="$case_dir/github-output" \
+        MOCK_UNAME_M="$architecture" \
+        MOCK_AVAILABLE="$available" \
+        MOCK_FIXTURES="$TEST_DIR/fixtures" \
+        MOCK_CURL_LOG="$case_dir/curl.log" \
+        bash "$ROOT_DIR/install.sh" > "$case_dir/install.log" 2>&1
+
+    assert_contains "$case_dir/curl.log" "head https://github.com/openharmony-zig/zig-patch/releases/download/test%2Btag/${expected_archive}.tar.xz"
+    assert_contains "$case_dir/curl.log" "download https://github.com/openharmony-zig/zig-patch/releases/download/test%2Btag/${expected_archive}.tar.${available}"
+    assert_contains "$case_dir/github-output" "zig-version=0.16.0-test"
+    assert_contains "$case_dir/github-output" "platform=${expected_platform}"
+}
+
+run_success_case \
+    ohos-aarch64 aarch64 xz \
+    zig-aarch64-linux-ohos-baseline ohos-arm64
+run_success_case \
+    ohos-armv7 armv7l xz \
+    'zig-arm-linux-ohoseabi-generic+v7a' ohos-arm
+run_success_case \
+    ohos-x86_64 x86_64 xz \
+    zig-x86_64-linux-ohos-baseline ohos-x86_64
+run_success_case \
+    gz-fallback aarch64 gz \
+    zig-aarch64-linux-ohos-baseline ohos-arm64
+
+missing_dir="$TEST_DIR/missing"
+mkdir -p "$missing_dir/home"
+: > "$missing_dir/github-path"
+: > "$missing_dir/github-output"
+: > "$missing_dir/curl.log"
+
+if env \
+    PATH="$MOCK_BIN:$PATH" \
+    HOME="$missing_dir/home" \
+    OSTYPE="linux-ohos" \
+    INPUT_TAG="missing" \
+    INPUT_CACHE="false" \
+    INPUT_WAS_CACHED="false" \
+    GITHUB_PATH="$missing_dir/github-path" \
+    GITHUB_OUTPUT="$missing_dir/github-output" \
+    MOCK_UNAME_M="aarch64" \
+    MOCK_AVAILABLE="none" \
+    MOCK_FIXTURES="$TEST_DIR/fixtures" \
+    MOCK_CURL_LOG="$missing_dir/curl.log" \
+    bash "$ROOT_DIR/install.sh" > "$missing_dir/install.log" 2>&1; then
+    echo "Expected the missing archive case to fail" >&2
+    exit 1
+fi
+
+assert_contains "$missing_dir/curl.log" ".tar.xz"
+assert_contains "$missing_dir/curl.log" ".tar.gz"
+assert_contains "$missing_dir/install.log" "Error: No Zig OHOS archive found"
+
+echo "All install tests passed"
diff --git a/tests/mocks/curl b/tests/mocks/curl
new file mode 100755
index 0000000..a612982
--- /dev/null
+++ b/tests/mocks/curl
@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+
+set -eu
+
+is_head=false
+output_file=""
+url=""
+
+while [[ $# -gt 0 ]]; do
+    case "$1" in
+        --head)
+            is_head=true
+            shift
+            ;;
+        -o|--output)
+            output_file="$2"
+            shift 2
+            ;;
+        *)
+            url="$1"
+            shift
+            ;;
+    esac
+done
+
+if [[ "$is_head" == "true" ]]; then
+    printf 'head %s\n' "$url" >> "$MOCK_CURL_LOG"
+    case "$MOCK_AVAILABLE" in
+        xz)
+            [[ "$url" == *.tar.xz ]]
+            ;;
+        gz)
+            [[ "$url" == *.tar.gz ]]
+            ;;
+        none)
+            exit 22
+            ;;
+        *)
+            echo "Unknown MOCK_AVAILABLE value: $MOCK_AVAILABLE" >&2
+            exit 2
+            ;;
+    esac
+    exit
+fi
+
+printf 'download %s\n' "$url" >> "$MOCK_CURL_LOG"
+case "$url" in
+    *.tar.xz)
+        cp "$MOCK_FIXTURES/zig.tar.xz" "$output_file"
+        ;;
+    *.tar.gz)
+        cp "$MOCK_FIXTURES/zig.tar.gz" "$output_file"
+        ;;
+    *)
+        echo "Unexpected download URL: $url" >&2
+        exit 2
+        ;;
+esac
diff --git a/tests/mocks/uname b/tests/mocks/uname
new file mode 100755
index 0000000..d2e863e
--- /dev/null
+++ b/tests/mocks/uname
@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+set -eu
+
+if [[ "${1:-}" == "-m" ]]; then
+    printf '%s\n' "$MOCK_UNAME_M"
+else
+    /usr/bin/uname "$@"
+fi