First of all, designed model for aerial targeis threat evaluation based on agent, and than researched construction steps of model about aerial targeis threat evaluation from four aspects that is thinking on factors, knowledge database building on factors, knowledge database studying on factors and aerial targeis threat comprehensive evaluation respectively, finally given example. The result of example anslysis show that structuring aerial targeis threat based on agent can realize intelligence and generalization, improving aerial targeis threat evaluation accuracy and adaptation,etc.