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It puts forward a method of improved grey interrelated analysis in the evaluation of aerial target threat degree. Firstly it sets up comprehensive difference matrix in order to improve the sensitivity and accuracy of threat degree calculation. Secondly it fixes every index weight through threat membership degree. Thirdly it calculates and arranges the weighted average comprehensive value in an order. The experiment result shows that the evaluation result of using improved grey interrelated analysis method and genetic neural network algorithm are totally unanimous.