change to China mirrors, run with: curl -sSL https://git.io/vMKbc | sh

rpi-mirrors.sh

#!/bin/bash
sudo mv /etc/apt/sources.list /etc/apt/sources.list.orig 
sudo sh -c 'cat > /etc/apt/sources.list << "EOF"
deb http://mirrors.neusoft.edu.cn/raspbian/raspbian/ jessie main contrib non-free rpi
#deb-src http://mirrors.neusoft.edu.cn/raspbian/raspbian/ jessie main contrib non-free rpi
EOF'
sudo mv /etc/apt/sources.list.d/raspi.list /etc/apt/sources.list.d/raspi.list.orig 
sudo sh -c 'cat > /etc/apt/sources.list.d/raspi.list << "EOF"
deb http://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian/ jessie main ui
#deb-src http://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian/ jessie main ui
EOF'
sudo apt-get update && sudo apt-get upgrade -y