In order to improve the development efficiency of radar equipment testing software and the interchangeability of test instrument,detailed cases on the basis of summarized test requirements, based on demand-driven a new test software developement model was designed by UML language.And the class diagram design method in this model was introduced in detail.As a matter of fact,the configuration of radar equipment testing software should be completed by this model.This model was suitable for the development of other equipment testing software.