diff --git a/src/download.py b/src/download.py
index b85c7cc..73311ec 100644
--- a/src/download.py
+++ b/src/download.py
@@ -10,12 +10,18 @@
 from io import StringIO
 from contextlib import redirect_stdout
 import string
+import urllib3
+urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
 
 mp3_url_template = "https://antiserver.kuwo.cn/anti.s?type=convert_url&rid={}&format=mp3&response=url"
 music_name_template = "{name}_{artist}_{album}_{id}.mp3"
 
-destination_folder = os.getenv('MUSIC_FOLDER', "/nas/music")
+destination_folder = os.getenv('MUSIC_FOLDER', "/nas/music/kuwo")
 root_url = os.getenv("MUSIC_URL",  "https://www.kuwo.cn/bang/content?name=%E6%8A%96%E9%9F%B3%E7%83%AD%E6%AD%8C%E6%A6%9C")
+invalid_music_file_path = os.path.join(destination_folder, "__INVALID_MUSICS.txt")
+if not os.path.exists(invalid_music_file_path):
+    open(invalid_music_file_path, 'a').close()
+invalid_musics=set(line.strip() for line in open(invalid_music_file_path))
 @dataclass
 class Music:
     def __init__(self, id: str, artist: str, album: str, name: str, pay:str):
@@ -28,9 +34,9 @@
         self.targeting_file = ""
         self.status ="pending"
         self.file_name = ""
-    
+
     def exists(self):
-        return os.path.exists(self.targeting_file)
+        return os.path.exists(self.targeting_file) or self.file_name in invalid_musics
 
     def download(self):
         print("Checking url " + self.url)
@@ -116,6 +122,15 @@
     except:
         print("error")
     print("[Info] Download music \"{}\" with the status: {}".format(music.file_name, music.status))
+    # If the size of the file is small to an identical number, it means the music is invalid.
+    if  os.path.exists(music.targeting_file) and os.path.getsize(music.targeting_file) ==  181521:
+        with open(invalid_music_file_path, 'a') as the_file:
+            the_file.write("{}\n".format(music.file_name))
+        invalid_musics.add(music.file_name)
+        os.remove(music.targeting_file)
+        new_music_count -=1
+        print("[Info] Delete the music \"{}\" due to the invalid size".format(music.file_name))
+
 print("[Summary] Found {} new musics".format(new_music_count))
 
 # print("Processing the music")
diff --git a/src/sort.py b/src/sort.py
new file mode 100644
index 0000000..0b15059
--- /dev/null
+++ b/src/sort.py
@@ -0,0 +1,43 @@
+import glob
+import os
+
+musics=set()
+def retrieve_musics(path):
+    files = glob.glob(path + '/**/*.mp3', recursive=True)
+    for file in files:
+        if file.find("@eaDir") == -1:
+            tokens = file.split("/")
+            fname = tokens[len(tokens)-1]
+            if fname in musics:
+                print ("{} in the set already".format(fname))
+                os.remove(file)
+            else:
+                musics.add(fname)
+                print ("add {} into set".format(fname))
+                os.rename(file, "/nas/music/抖音类歌曲/{}".format(fname))
+
+
+filename="__INVALID_MUSICS.txt"
+def loadInvalidMusicsFromFile(path):
+    if not os.path.exists(path):
+        open(path, 'a').close()
+    return set(line.strip() for line in open(path))
+
+    
+def findInvalidMusics(path):
+    invalidfilepath = os.path.join(path, filename)
+    invalidmusics = loadInvalidMusicsFromFile(invalidfilepath)
+    files = glob.glob(path + '/**/*.mp3', recursive=True)
+    for file in files:
+        if file.find("@eaDir") == -1:
+            tokens = file.split("/")
+            fname = tokens[len(tokens)-1]
+            sz  = os.path.getsize(file)
+            if sz == 181521 and fname not in invalidmusics:
+                with open(invalidfilepath, 'a') as the_file:
+                    the_file.write("{}\n".format(fname))
+                invalidmusics.add(fname)
+                print("file found: {} is invalid and add it into the list".format(file))
+                os.remove(file)
+                
+findInvalidMusics("/nas/music/kuwo")
\ No newline at end of file
diff --git a/test/start.sh b/test/start.sh
new file mode 100644
index 0000000..9e4bdf2
--- /dev/null
+++ b/test/start.sh
@@ -0,0 +1,6 @@
+# /bin/bash
+
+export MUSIC_OP="download"
+export MUSIC_FOLDER="music"
+python3 ../src/download.py
+