diff --git a/sources/sources.list.aliyun b/sources/sources.list.aliyun
deleted file mode 100644
index b381758..0000000
--- a/sources/sources.list.aliyun
+++ /dev/null
@@ -1,9 +0,0 @@
-deb http://mirrors.aliyun.com/debian/ buster main non-free contrib
-deb http://mirrors.aliyun.com/debian-security buster/updates main
-deb http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib
-deb http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib
- 
-deb-src http://mirrors.aliyun.com/debian-security buster/updates main
-deb-src http://mirrors.aliyun.com/debian/ buster main non-free contrib
-deb-src http://mirrors.aliyun.com/debian/ buster-updates main non-free contrib
-deb-src http://mirrors.aliyun.com/debian/ buster-backports main non-free contrib
diff --git a/sources/sources.list.default b/sources/sources.list.default
deleted file mode 100644
index 5e33983..0000000
--- a/sources/sources.list.default
+++ /dev/null
@@ -1,6 +0,0 @@
-# deb http://snapshot.debian.org/archive/debian/20200607T000000Z buster main
-deb http://deb.debian.org/debian buster main
-# deb http://snapshot.debian.org/archive/debian-security/20200607T000000Z buster/updates main
-deb http://security.debian.org/debian-security buster/updates main
-# deb http://snapshot.debian.org/archive/debian/20200607T000000Z buster-updates main
-deb http://deb.debian.org/debian buster-updates main
diff --git a/sources/sources.list.huawei b/sources/sources.list.huawei
deleted file mode 100644
index 2cfcba5..0000000
--- a/sources/sources.list.huawei
+++ /dev/null
@@ -1,9 +0,0 @@
-deb http://mirrors.huaweicloud.com/debian/ buster main contrib non-free
-deb http://mirrors.huaweicloud.com/debian/ buster-updates main contrib non-free
-deb http://mirrors.huaweicloud.com/debian/ buster-backports main contrib non-free
-deb http://mirrors.huaweicloud.com/debian-security/ buster/updates main contrib non-free
- 
-deb-src http://mirrors.huaweicloud.com/debian/ buster main contrib non-free
-deb-src http://mirrors.huaweicloud.com/debian/ buster-updates main contrib non-free
-deb-src http://mirrors.huaweicloud.com/debian/ buster-backports main contrib non-free 
-
diff --git a/sources/sources.list.tencent b/sources/sources.list.tencent
deleted file mode 100644
index dd0cb32..0000000
--- a/sources/sources.list.tencent
+++ /dev/null
@@ -1,10 +0,0 @@
-deb http://mirrors.cloud.tencent.com/debian/ buster main non-free contrib
-deb http://mirrors.cloud.tencent.com/debian-security buster/updates main
-deb http://mirrors.cloud.tencent.com/debian/ buster-updates main non-free contrib
-deb http://mirrors.cloud.tencent.com/debian/ buster-backports main non-free contrib
- 
-deb-src http://mirrors.cloud.tencent.com/debian-security buster/updates main
-deb-src http://mirrors.cloud.tencent.com/debian/ buster main non-free contrib
-deb-src http://mirrors.cloud.tencent.com/debian/ buster-updates main non-free contrib
-deb-src http://mirrors.cloud.tencent.com/debian/ buster-backports main non-free contrib
-
diff --git a/sources/sources.list.ustc b/sources/sources.list.ustc
deleted file mode 100644
index b50c198..0000000
--- a/sources/sources.list.ustc
+++ /dev/null
@@ -1,10 +0,0 @@
-deb http://mirrors.ustc.edu.cn/debian/ buster main contrib non-free
-deb http://mirrors.ustc.edu.cn/debian/ buster-updates main contrib non-free
-deb http://mirrors.ustc.edu.cn/debian/ buster-backports main contrib non-free
-deb http://mirrors.ustc.edu.cn/debian-security/ buster/updates main contrib non-free
- 
-deb-src http://mirrors.ustc.edu.cn/debian/ buster main contrib non-free
-deb-src http://mirrors.ustc.edu.cn/debian/ buster-updates main contrib non-free
-deb-src http://mirrors.ustc.edu.cn/debian/ buster-backports main contrib non-free
-deb-src http://mirrors.ustc.edu.cn/debian-security/ buster/updates main contrib non-free
-