美国的
deb http://ftp.us.debian.org/debian stable main contrib non-free
deb-src http://ftp.us.debian.org/debian stable main contrib non-free
deb http://ftp.debian.org/debian/ stable-updates main contrib non-free
deb-src http://ftp.debian.org/debian/ stable-updates main contrib non-free
deb http://security.debian.org/ stable/updates main contrib non-free
deb-src http://security.debian.org/ stable/updates main contrib non-free
中科大的源
deb https://mirrors.ustc.edu.cn/debian stable main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian stable main contrib non-free deb https://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian stable-updates main contrib non-free deb https://mirrors.ustc.edu.cn/debian-security/ stable/updates main contrib non-free deb-src https://mirrors.ustc.edu.cn/debian-security/ stable/updates main contrib non-free
这个是源生成器的页面地址：http://debgen.simplylinux.ch/
官方cd列表
http://cdimage.debian.org/cdimage/
具体可以参考
http://mirrors.ustc.edu.cn/help/