Abstract: Taking each factor that affects the support efficiency of electronic maintenance vehicle into consideration and according to the characteristics of researching objects,an integrated evaluative guide line system of the support efficiency of electronic maintenance vehicles is established by Delphi technique.The weighted entropy is adopted to ascertain the weight of each index so as to eliminate the subjectivity of each factor,which makes the evaluative result be coincident with the practice.In virtue of the gray theory,a gray integrated evaluative model is constructed and validated by an example,and the conclusion tallies with an external evaluative result.