Through the study of aircraft conflict decision model, this paper expounds the way of two kinds of model building and concrete application method, feature modeling method based on two kinds of models and algorithm proposed a new conflict decision model, simplifying the classification of flight dynamics and spacecraft reserve set, with poor navigation, aircraft relative to trend, warning distance as the main influence factors, by using MATLAB radar historical data to the new building has carried on the simulation model, the results prove that model in a certain extent, improve the accuracy of the conflict detection, and meet the minimum requirement of real-time and false alarm rate, guarantee the safe and efficient operation of the aircraft.