diff --git a/.gitignore b/.gitignore
index 0f7f06fe..b3f5e43a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,6 @@
 venv
 __pycache__
 .coverage
+
+# support file
+support
diff --git a/zephyr/west/gigadevice.py b/zephyr/west/gigadevice.py
new file mode 100755
index 00000000..fea128cc
--- /dev/null
+++ b/zephyr/west/gigadevice.py
@@ -0,0 +1,93 @@
+# Copyright (c) 2023 YuLong Yao <feilongphone@gmail.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+'''gigadevice.py
+
+Gigadevice west extension for prepare develop environment.'''
+
+from textwrap import dedent            # just for nicer code indentation
+
+from west.commands import WestCommand  # your extension must subclass this
+from west import log                   # use this for user output
+
+from pathlib import Path
+import yaml
+import os
+
+REPO_ROOT = Path(__file__).absolute().parents[2]
+"""Repository root (used for input/output default folders)."""
+
+
+class Install:
+    def __init__(self, config=REPO_ROOT / 'zephyr' / 'west' / 'gigadevice.yml'):
+        self.config = self.parse_config(config)
+        self.pyocd_install()
+
+    def parse_config(self, config):
+        with open(config, 'r') as f:
+            return yaml.safe_load(f)
+
+    def pyocd_install(self):
+        for pyocd_packages in self.config['pyocd-packages']:
+            self.pyocd_install_one(pyocd_packages)
+
+    def pyocd_install_one(self, package):
+        print(package)
+        if 'url' in package:
+            self.pyocd_install_one_from_url(package)
+        else:
+            self.pyocd_install_one_from_mdk(package)
+
+    def pyocd_install_one_from_mdk(self, package):
+        # run shell command: pyocd pack install package['pack']
+        os.system('echo pyocd pack install ' + package['pack'])
+        pass
+
+    def pyocd_install_one_from_url(self, package):
+        file_name = '%s.rar' % package['pack']
+        # Download from url to tmp folder
+        log.inf('download', package['url'], 'to', file_name)
+        # unrar file to tmp folder
+        os.system(f'echo unrar x ${file_name}')
+        # find pack file in tmp folder
+        # check pack file hash value
+        # storage pack file to support folder
+        pass
+
+
+class Gigadevice(WestCommand):
+    def __init__(self):
+        super().__init__(
+            'gigadevice',  # gets stored as self.name
+            'Gigadevice tools for west framework',  # self.help
+            # self.description:
+            dedent('''
+            Gigadevice tools for west framework
+
+            Prepare develop environment for Gigadevice MCU.'''))
+
+    def do_add_parser(self, parser_adder):
+        # This is a bit of boilerplate, which allows you full control over the
+        # type of argparse handling you want. The "parser_adder" argument is
+        # the return value of an argparse.ArgumentParser.add_subparsers() call.
+        parser = parser_adder.add_parser(self.name,
+                                         help=self.help,
+                                         description=self.description)
+
+        # Add some example options using the standard argparse module API.
+        parser.add_argument('command', help='command to run')
+
+        return parser           # gets stored as self.parser
+
+    def do_run(self, args, unknown_args):
+        # This gets called when the user runs the command, e.g.:
+        #
+        #   $ west my-command-name -o FOO BAR
+        #   --optional is FOO
+        #   required is BAR
+        match args.command:
+            case 'install':
+                Install()
+            case _:
+                log.inf('command is', args.command, REPO_ROOT)
diff --git a/zephyr/west/gigadevice.yml b/zephyr/west/gigadevice.yml
new file mode 100644
index 00000000..92752518
--- /dev/null
+++ b/zephyr/west/gigadevice.yml
@@ -0,0 +1,9 @@
+# Copyright (c) 2023 YuLong Yao <feilongphone@gmail.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+pyocd-packages:
+  - pack: gd32e103 # pack in mdk website
+  - pack: gd32a503 # pack not in mdk website
+    url: https://www.gd32mcu.com/download/down/document_id/405/path_type/1
+    hash: 23c8840812ef9d86fbb87bca7d9c452c71bd9291
diff --git a/zephyr/west/west-commands.yml b/zephyr/west/west-commands.yml
new file mode 100644
index 00000000..bcf4a46e
--- /dev/null
+++ b/zephyr/west/west-commands.yml
@@ -0,0 +1,10 @@
+# Copyright (c) 2023 YuLong Yao <feilongphone@gmail.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+west-commands:
+  - file: zephyr/west/gigadevice.py
+    commands:
+      - name: gigadevice
+        class: Gigadevice
+        help: Gigadevice tools for west framework.