Abstract: In order to improve the logical reasoning ability of college students, and the teaching level of fluid mechanics, the problem-based teaching method is adopted. With the problem-oriented method in mind, step-by-step, the application of the problem-based teaching method is explained with examples in the fluid mechanics course. In the process of effective review and rigorous reasoning, scientific conclusions are drawn. The above practices achieve better teaching results, enhance the learning interest and the concentration of students, and improve students' ability of thinking and innovating independently.