新用户在安装Kali_Linux之后一定要做的就是更新国内源，与系统自带的国外源相比，国内源节约了许多的时间，带来了更高的下载效率。
修改更新源，原理是修改系统中的“sources.list”文件，所以我们使用任意编辑器打开这个文件（可能需要su权限，非root用户请自带sudo）
vim /etc/apt/sources.list
在文件顶端添加这些源即可，可以删除系统的官方源，也可以直接添加，一个源一行（可以用大量换行以示区分），我建议使用阿里云的Kali源，因为经我测试阿里云的效率比较高，中科大也是速度较快的Kali源
#中科大 kali源
deb http://mirrors.ustc.edu.cn/kali sana main non-free contrib
deb http://mirrors.ustc.edu.cn/kali-security/ sana/updates main contrib non-free
deb-src http://mirrors.ustc.edu.cn/kali-security/ sana/updates main contrib non-free
#阿里云 kali源
deb http://mirrors.aliyun.com/kali sana main non-free contrib
deb http://mirrors.aliyun.com/kali-security/ sana/updates main contrib non-free
deb-src http://mirrors.aliyun.com/kali-security/ sana/updates main contrib non-free下面放出所有的国内源
#官方源
deb http://http.kali.org/kali kali main non-free contrib
deb-src http://http.kali.org/kali kali main non-free contrib
deb http://security.kali.org/kali-security kali/updates main contrib non-free
#中科大 kali源
deb http://mirrors.ustc.edu.cn/kali kali main non-free contrib
deb-src http://mirrors.ustc.edu.cn/kali kali main non-free contrib
deb http://mirrors.ustc.edu.cn/kali-security kali/updates main contrib non-free
#新加坡 kali源
deb http://mirror.nus.edu.sg/kali/kali/ kali main non-free contrib
deb-src http://mirror.nus.edu.sg/kali/kali/ kali main non-free contrib
deb http://security.kali.org/kali-security kali/updates main contrib non-free
deb http://mirror.nus.edu.sg/kali/kali-security kali/updates main contrib non-free
deb-src http://mirror.nus.edu.sg/kali/kali-security kali/updates main contrib non-free
#阿里云 kali源
deb http://mirrors.aliyun.com/kali kali main non-free contrib
deb-src http://mirrors.aliyun.com/kali kali main non-free contrib
deb http://mirrors.aliyun.com/kali-security kali/updates main contrib non-free
#网易 Kali源
deb http://mirrors.163.com/debian wheezy main non-free contrib
deb-src http://mirrors.163.com/debian wheezy main non-free contrib
deb http://mirrors.163.com/debian wheezy-proposed-updates main non-free contrib
deb-src http://mirrors.163.com/debian wheezy-proposed-updates main non-free contrib
deb-src http://mirrors.163.com/debian-security wheezy/updates main non-free contrib
deb http://mirrors.163.com/debian-security wheezy/updates main non-free contrib
#上海交大 Kali源 (比较慢)
#deb http://ftp.sjtu.edu.cn/debian wheezy main non-free contrib
#deb-src http://ftp.sjtu.edu.cn/debian wheezy main non-free contrib
#deb http://ftp.sjtu.edu.cn/debian wheezy-proposed-updates main non-free contrib
#deb-src http://ftp.sjtu.edu.cn/debian wheezy-proposed-updates main non-free contrib
#deb http://ftp.sjtu.edu.cn/debian-security wheezy/updates main non-free contrib
#deb-src http://ftp.sjtu.edu.cn/debian-security wheezy/updates main non-free contrib最后，保存文件，即可使用新的国内源进行更新操作了
下面顺带写一下Kali_Linux更新代码（非root用户请自带sudo）
apt-get update & apt-get upgrade
apt-get dist-upgrade
apt-get clean
全文完:)