diff --git a/README.md b/README.md
index 3df927f..102aece 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,7 @@ run `python demo.py`, will load the released text2shape model on hugging face an
 
 ## Released checkpoint and samples 
 * will be release soon
+* after download, run the checksum with `python ./script/check_sum.py ./lion_ckpt.zip`
 * put the downloaded file under `./lion_ckpt/`
 
 ## Training 
diff --git a/script/check_sum.py b/script/check_sum.py
new file mode 100644
index 0000000..1e129ff
--- /dev/null
+++ b/script/check_sum.py
@@ -0,0 +1,17 @@
+import sys
+import hashlib
+def sha256_checksum(file_path):
+    sha256 = hashlib.sha256()
+    with open(file_path, 'rb') as file:
+        for chunk in iter(lambda: file.read(4096), b''):
+            sha256.update(chunk)
+    return sha256.hexdigest()
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        print("Usage: python script_name.py zip_file_path")
+        sys.exit(1)
+
+    zip_file_path = sys.argv[1]
+    checksum = sha256_checksum(zip_file_path)
+    assert(checksum == "5a31da2221fdad3bb1312d46e1201cb7a3876066396897091bfed0ce459a4146")
+    print(f"SHA-256 checksum of '{zip_file_path}': {checksum}")