Abstract: The current situation of the computer auxiliary teaching, the characteristic of the physics, and the difference between the computer auxiliary teaching and the traditional teaching are analyzed. According to the authors practice of the computer auxiliary teaching in physical teaching, the application of the computer auxiliary teaching, especially, the application of CAI, in university physical teaching is discussed. The handle of the key technique for the application of CAI in physical experiment teaching is also introduced. As an example, the application of the software named PSpice in electromagnetics experiment is presented.