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Researching is about evaluation and sort of the direction that targets are most likely to attack along before deploying air defence fire units around key point. In this paper, firstly, air attacking weapons attacking direction evaluation index system and quantitative rules are provided depend on the modern air attack character. Using grey clustering theory to divide the likely attack direction into different classes and sort them according to the similar coefficients. Then we rank the different likely directions in order of evaluation scores using non-uniform grey relational method based on AHP and DEA. The simulation results proved that this method can solve this problem. [ABSTRACT FROM AUTHOR]