A comprehensive evaluation index system is established according to the plan-development characteristics of Air and Missile Defense warhead. Utility function and expert evaluation methods are introduced to quantify uniformly the quantitative index and the qualitative index, the big difference in dimension of significance of evaluation index, evaluation with different dimension and different index are solved. And then, a model of integrated evaluation for developing plan of air defense and antimissile warhead is put forward based on the gray clustering theory, the clustering weight of the evaluation index is ascertained and calculated by using of the Delphi Method and the Analytic Hierarchy Process. The evaluations for the superior and interior of developing plan are realized by calculating and comparing the decision-making measures of all plans. The rationality of the model is verified through example analysis.