For the problem that the credibility of ground air defence deployment schemes is not high,which is caused by the strong subjectivity in the process of making evaluation weights of different factors,the method of determining the weight using entropy weight of adjacent superior membership degree is proposed.The objective weight is obtained by entropy weight method,and the subjective weight is obtained by combining the subjective and objective weights,and the deployment plan is evaluated and optimized by two-level fuzzy comprehensive evaluation.An example shows that the adjacent optimal ownership degree entropy weight has high application value in the ground air defense deployment scheme,which,combined with fuzzy comprehensive evaluation,can effectively solve the difficulty in determining the weight and the randomness of influencing factors in the evaluation,and can make the evaluation result more credible.