Mathematics teaching of "Nature": what it should mean and the way to practice

"Natural" mathematics teaching is a kind of idea, a kind of teaching proposition, and should become a kind of teaching consciousness. From three aspects of knowledge logic, cognitive logic and teaching logic, we can see the proper meaning of "Natural" mathematics teaching. On this basis, the practical direction of "Natural" mathematics teaching is given: clarifying the internal logic of mathematics, basing on the cognitive basis of students, changing the appearance of mathematics.