ABSTRACT
Pierre Simon Laplace (1749-1827), known as "Newton of France", was the founder of analytical probability theory, invented Laplace’s law and integrated celestial mechanics. He promoted the development of analytical probability theory, led classical probability theory to follow the world trend, and also laid a solid foundation for the emergence of modern probability theory. He actively extended the application of probability theory to the fields of decision-making theory and maritime insurance. Laplace's law was not only applied in the field of physics, but also in the field of medicine, especially in cardiovascular, urology, anorectal and other disciplines, which is crucial for the interpretation of clinical symptoms and the selection of treatment methods. Laplace also used calculus to explore classical mechanics, successfully explained Newton's legacy of multi-planetary interaction.