Abstract: Designed physics experiment,which has characteristics of helpful to the training of practical ability,cultivation of innovative consciousness and improving the quality of scientific research.Therefore,it is an important content in the subject of teaching reform of college physical experiment.This paper points out the content of design of physical experiment and summary the teaching points,introduces and analyzes the present situation of our school in Designed physics experiment.Aiming at the existing problems,we put forward effective reform measures to make a better performance in the designed physics experiment and take the desigh of potentionmeter as an example.This research has taken teaching process and teaching decomposition refinement as breaking through for conducted the research and the practice.Through the teaching practice of the two terms,we has obtained the good teaching effect,achieved the expected teaching goal.