Mathematical Principles of Natural Philosophy is the representative work of British physicist Newton, in which he put forward three basic laws of classical mechanics and the law of universal gravitation. The main content is the establishment and application of the law of universal gravitation. The second chapter of the first part of this book is the centripetal force methodology. Starting from this chapter, Newton carefully studied various special forms of motion involving centripetal force, and gradually extended to the third part of the discussion on the cosmic system, established classical mechanics, and opened the prelude to the modern scientific revolution. Newton attached great importance to the methods and attitudes of scientific research, and he pointed out four basic rules for studying nature. The core of these four rules is to emphasize the objectivity of research, that is, to adhere to the materialistic attitude towards natural research. However, the materialistic viewpoint of denying the motion properties of things themselves plunged him into the quagmire of mechanical materialism (metaphysics), so that he finally thought that the first force to promote the world movement was the hand of God, thus slipping into the quagmire of objective idealism, which is also the reason why he praised God in the last general statement of this book. Mathematical Principles of Natural Philosophy is not only a classic work of physics, but also a work of mechanical materialism. Newton is also a representative figure of mechanical materialism, as well as helvetius and Ramatri. At the same time, the book also tells the related content of calculus.