Abstract: Professional introduction course is the major enlightenment education course for freshmen. It is an introductory course for undergraduates to understand the major connotation and increase the students' interest. However, it is not easy to construct the course because of its characteristic as "the double-edged sword". Based on the practice of the course "introduction to mechanics" in BIT, this paper tries to discuss the key points and difficulties of the course, and summarize the gains and losses in our practice, which might provide some experience and lessons for the development of similar courses.