Zen is one of the main schools of Buddhism, which advocates practicing meditation, hence its name. It is also called Buddhism because it takes investigation as its main purpose and thoroughly sees the origin of the heart. It was first introduced to China from Dharma, and then to Hui Ke, monks and Taoists. To the fifth ancestor Hongren, it was divided into South Hui Neng and North Shen Xiu, so-called "South can be North America". Huineng's famous disciples are Nanyue Huairang, Qingyuan Xingsi, Heze Shenhui, Nanyang Zhonghui and Yongjia Xuanjue, which form the mainstream of Zen, among which Nanyue and Qingyuan are the most popular. There are two situations of Nanyue Chuanhao: Fuyang and Lin Ji. Qingyuan is divided into Cao Dong, Yunmen and Fayan. The world calls it "five". Among them, two boxes in Cao Dong, Lin Ji have the longest circulation time. In Song Dynasty, Lin Jizong formed Huanglong School and Yang Qi School, which were collectively called "Five Schools and Seven Schools".