Moral education is the main task of Ideological and political education in Colleges and universities. It is closely related to the development of professional ethics education in Colleges and universities to cultivate college students to play their talents in the future industry, resist temptation, and keep the moral and legal bottom line. It is of great practical significance to do a good job of College Students' professional ethics education centering on "moral cultivation" to adapt to the talent strategy of national economic construction and development and to form a good social professional ethics. Law is the essential and inevitable connection in the development of objective things. Professional ethics education in Colleges and universities should follow the law of subject interaction, unity of knowledge and practice, "marginal effect" law, cooperation and co construction law, level gradual law and other professional ethics education laws to improve the effect of professional ethics education.