University physics experiment course is a compusory basic experiment course of college students, however, the traditional physical experiment teaching always ignores the cultivation of students innovation ability and practice ability. The topic selection principle of design experiments, teaching requirements and teaching methods are expounded in the first part of the article,and a typical example about design experiment is enumerated for analysis in the middle of the article,and some suggestions on design experiment are proposed at the end of the artcle. It is obvious that the design physics experiment is helpful to improve the students＇ ability of innovation.