Probe into the essentiality that establish preparatory physics experiment in college physics experiment teaching,and how to do in preparatory physics experiment based on the achievement in subject research.

Designing physics experiment is a kind of physics experiment designed by stydent themselves under the special conditions and requirements,through which the designing physics experiment can effectively fosters student s ability of ananlysis,making,brazing new trails and firm-indomitable fine quality.

This paper expounds the characteristics,requirements and process of the development of teaching model for designed physics experiment,and then indicates that the model development plays a very important role in cultivating students creative ability.

This paper brings forward the necessity and enforcement tactics of proceeding the designed physics experiment in agriculture specialty,and introduces the positive effect of designed physics experiment on the student s creative practice ability.

The paper discusses the subject-selecting and design in the designing physical experiment and introduces the principles of selecting subjects,discusses mainly the problem of designing some experimental blocks.