diff --git a/app/services/material.py b/app/services/material.py
index 2dda2b2..fd48b24 100644
--- a/app/services/material.py
+++ b/app/services/material.py
@@ -1,5 +1,5 @@
+import os
 import random
-import time
 from urllib.parse import urlencode
 
 import requests
@@ -80,9 +80,21 @@ def search_videos(search_term: str,
     return []
 
 
-def save_video(video_url: str, save_dir: str) -> str:
-    video_id = f"vid-{str(int(time.time() * 1000))}"
+def save_video(video_url: str, save_dir: str = "") -> str:
+    if not save_dir:
+        save_dir = utils.storage_dir("cache_videos")
+
+    url_without_query = video_url.split("?")[0]
+    url_hash = utils.md5(url_without_query)
+    video_id = f"vid-{url_hash}"
     video_path = f"{save_dir}/{video_id}.mp4"
+
+    # if video already exists, return the path
+    if os.path.exists(video_path):
+        logger.info(f"video already exists: {video_path}")
+        return video_path
+
+    # if video does not exist, download it
     proxies = config.pexels.get("proxies", None)
     with open(video_path, "wb") as f:
         f.write(requests.get(video_url, proxies=proxies, verify=False, timeout=(10, 180)).content)
@@ -116,7 +128,12 @@ def download_videos(task_id: str,
     logger.info(
         f"found total videos: {len(valid_video_items)}, required duration: {audio_duration} seconds, found duration: {found_duration} seconds")
     video_paths = []
-    save_dir = utils.task_dir(task_id)
+
+    material_directory = config.app.get("material_directory", "").strip()
+    if material_directory == "task":
+        material_directory = utils.task_dir(task_id)
+    elif material_directory and not os.path.isdir(material_directory):
+        material_directory = ""
 
     if video_contact_mode.value == VideoConcatMode.random.value:
         random.shuffle(valid_video_items)
@@ -125,7 +142,8 @@ def download_videos(task_id: str,
     for item in valid_video_items:
         try:
             logger.info(f"downloading video: {item.url}")
-            saved_video_path = save_video(item.url, save_dir)
+            saved_video_path = save_video(video_url=item.url, save_dir=material_directory)
+            logger.info(f"video saved: {saved_video_path}")
             video_paths.append(saved_video_path)
             seconds = min(max_clip_duration, item.duration)
             total_duration += seconds
@@ -136,3 +154,7 @@ def download_videos(task_id: str,
             logger.error(f"failed to download video: {utils.to_json(item)} => {str(e)}")
     logger.success(f"downloaded {len(video_paths)} videos")
     return video_paths
+
+
+if __name__ == "__main__":
+    download_videos("test123", ["cat"], audio_duration=100)
diff --git a/app/utils/utils.py b/app/utils/utils.py
index 5a4f7a1..086e65c 100644
--- a/app/utils/utils.py
+++ b/app/utils/utils.py
@@ -70,6 +70,8 @@ def storage_dir(sub_dir: str = ""):
     d = os.path.join(root_dir(), "storage")
     if sub_dir:
         d = os.path.join(d, sub_dir)
+    if not os.path.exists(d):
+        os.makedirs(d)
     return d
 
 
@@ -169,3 +171,8 @@ def split_string_by_punctuations(s):
             result.append(txt.strip())
             txt = ""
     return result
+
+
+def md5(text):
+    import hashlib
+    return hashlib.md5(text.encode('utf-8')).hexdigest()
diff --git a/config.example.toml b/config.example.toml
index 19d98f4..fd4adba 100644
--- a/config.example.toml
+++ b/config.example.toml
@@ -111,6 +111,19 @@
     endpoint=""
 
 
+    # Video material storage location
+    # material_directory = ""                    # Indicates that video materials will be downloaded to the default folder, the default folder is ./storage/cache_videos under the current project
+    # material_directory = "/user/harry/videos"  # Indicates that video materials will be downloaded to a specified folder
+    # material_directory = "task"                # Indicates that video materials will be downloaded to the current task's folder, this method does not allow sharing of already downloaded video materials
+
+    # 视频素材存放位置
+    # material_directory = ""                    #表示将视频素材下载到默认的文件夹，默认文件夹为当前项目下的 ./storage/cache_videos
+    # material_directory = "/user/harry/videos"  #表示将视频素材下载到指定的文件夹中
+    # material_directory = "task"                #表示将视频素材下载到当前任务的文件夹中，这种方式无法共享已经下载的视频素材
+
+    material_directory = ""
+
+
 [whisper]
     # Only effective when subtitle_provider is "whisper"