diff --git a/.env b/.env
new file mode 100644
index 0000000..c9f25f3
--- /dev/null
+++ b/.env
@@ -0,0 +1,7 @@
+NEW_PIC_BED="COS"
+
+COS_SECRET_ID=""
+COS_SECRET_KEY=""
+COS_BUCKET=""
+COS_REGION=""
+COS_SAVE_PATH=""
diff --git a/.gitignore b/.gitignore
index 82f9275..71242bf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,9 @@ __pycache__/
 *.py[cod]
 *$py.class
 
+# Work dir and files
+.idea
+
 # C extensions
 *.so
 
@@ -122,7 +125,6 @@ celerybeat.pid
 *.sage.py
 
 # Environments
-.env
 .venv
 env/
 venv/
diff --git a/README.md b/README.md
index adfc942..d830805 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,58 @@
 # ezMove
-Script for batch migration of Markdown images to image hosting
+
+This is a script for batch migration of Markdown images to image hosting.
+
+## Quick Start
+
+### Step 0
+
+Install required dependencies.
+
+```shell
+pip install -r .\requirements.txt
+```
+
+### Step 1
+
+Fill in the configuration information of the image hosting in the `.env` file.
+
+For example (use Tencent COS):
+
+```env
+NEW_PIC_BED="COS"
+
+COS_SECRET_ID=""
+COS_SECRET_KEY=""
+COS_BUCKET=""
+COS_REGION=""
+COS_SAVE_PATH=""
+```
+
+### Step 2
+
+Fill in the Markdown file directory of the image hosting service to be migrated in `main.py`
+
+For example:
+
+```python
+# Fill in the directory of Markdown files waiting to be migrated here
+markdown_files = find_files('./my_blogs')
+```
+
+### Step 3
+
+Run `main.py` and have a cup of coffee while waiting for the program to finish running.
+
+```shell
+python3 main.py
+```
+
+
+## Todo
+
+- [x] Support Tencent Cloud COS 
+- [ ] Support Alibaba Cloud OSS
+- [ ] Support Qiniu Cloud Image Hosting
+- [ ] ...
+
+
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..5d87b73
--- /dev/null
+++ b/main.py
@@ -0,0 +1,12 @@
+from dotenv import load_dotenv
+from markdown import *
+
+load_dotenv()
+new_pic_bed = os.getenv('NEW_PIC_BED')
+
+if __name__ == '__main__':
+    # Fill in the directory of Markdown files waiting to be migrated here
+    markdown_files = find_files('')
+
+    for markdown_file in markdown_files:
+        replace_pic_bed(markdown_file, new_pic_bed)
diff --git a/markdown.py b/markdown.py
new file mode 100644
index 0000000..01fe01b
--- /dev/null
+++ b/markdown.py
@@ -0,0 +1,46 @@
+from uploader import Uploader
+import os
+import re
+
+uploader = Uploader()
+
+
+# find all markdown files in specified directory
+def find_files(directory):
+    markdown_files = []
+    for root, dirs, files in os.walk(directory):
+        for file in files:
+            if file.endswith(".md"):
+                markdown_files.append(os.path.join(root, file))
+
+    return markdown_files
+
+
+# replace pic_bed for single markdown file
+def replace_pic_bed(markdown_file, new_pic_bed):
+    img_pattern = re.compile(r'!\[.*\]\((.*)\)')
+    url_pattern = re.compile(r'\((.*)\)')
+
+    old_file = open(markdown_file, 'r', encoding='utf-8')
+    old_lines = old_file.readlines()
+    old_file.close()
+
+    new_file = open(markdown_file, 'w', encoding='utf-8')
+    for line in old_lines:
+        img_match = img_pattern.search(line)
+        if img_match:
+            url_match = url_pattern.search(line)
+            if url_match:
+                old_url = url_match.group(1)
+                new_url = uploader.upload_web_img(old_url, new_pic_bed)
+
+                if new_url != '':
+                    line = re.sub(img_pattern, lambda match: f'![]({new_url})', line)
+                    print(f'-replaced {old_url} to {new_url}')
+                else:
+                    print(f'-upload failed {old_url}')
+
+        new_file.write(line)
+
+    new_file.close()
+    print(f'!finished {markdown_file}\n')
diff --git a/picbed/__init__.py b/picbed/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/picbed/cos.py b/picbed/cos.py
new file mode 100644
index 0000000..c831fc0
--- /dev/null
+++ b/picbed/cos.py
@@ -0,0 +1,37 @@
+# Tencent COS
+
+from dotenv import load_dotenv
+from qcloud_cos import CosConfig
+from qcloud_cos import CosS3Client
+from utils import get_current_timestamp
+import requests
+import os
+
+
+load_dotenv()
+
+region = os.getenv('COS_REGION')
+bucket = os.getenv('COS_BUCKET')
+secret_id = os.getenv('COS_SECRET_ID')
+secret_key = os.getenv('COS_SECRET_KEY')
+save_path = os.getenv('COS_SAVE_PATH')
+
+config = CosConfig(Region=region, SecretId=secret_id, SecretKey=secret_key, Token=None, Scheme='https')
+client = CosS3Client(config)
+
+
+def cos_upload_img(img_old_url):
+    try:
+        stream = requests.get(img_old_url)
+        new_img_name = f'{get_current_timestamp()}.png'
+        resp = client.put_object(
+            Bucket=bucket,
+            Body=stream,
+            Key=new_img_name,
+        )
+        if resp['ETag']:
+            return f'https://{bucket}.cos.{region}.myqcloud.com/{new_img_name}'
+        else:
+            return ''
+    except Exception as e:
+        print(e)
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..74b197e
Binary files /dev/null and b/requirements.txt differ
diff --git a/uploader.py b/uploader.py
new file mode 100644
index 0000000..d48caac
--- /dev/null
+++ b/uploader.py
@@ -0,0 +1,13 @@
+from picbed.cos import cos_upload_img
+
+
+class Uploader:
+    def __init__(self):
+        pass
+
+    def upload_web_img(self, img_url, pic_bed):
+        if pic_bed == 'COS':
+            return cos_upload_img(img_url)
+        else:
+            print('Unsupported image hosting type')
+            exit(1)
diff --git a/utils.py b/utils.py
new file mode 100644
index 0000000..a566b30
--- /dev/null
+++ b/utils.py
@@ -0,0 +1,5 @@
+import time
+
+
+def get_current_timestamp():
+    return int(time.time() * 1000)