In this paper, based on engineering development of terminal sensing ammunition and research situation of stable scanning of terminal sensing ammunition, a simulation model of double frequency to scanning angle used in parameter optimization for entire system was proposed. By processing actual data of scanning angle for terminal sensing ammunition, relative value range of parameter in the model was obtained, and according to actual results, the models of scanning angle were compared. The simulation result shows compared with actual result, the error of target acquisition probability and hit probability obtained by double frequency scanning angle is lower, and better than the model of single frequency scanning angle.