Abstract: Dhyana means the nature without thoughts and vexation.Daoyi develops the theory of Dhyana sect.He is famous for two sentences: Dao is like living in our daily life.People's heart is Buddha.These theories can be thought to come from the story which was told by Huairang.Huairang said he would grind brick into mirror.Daoyi was enlightened by what he had said.These two sentences mentioned show the negation and dualism transcendence of Dhyana sect.