Abstract: Aiming at the research of tracking filter algorithm for a certain type of radar of short-range active defense system, motion mod e1. And the model of establishment of interception point prediction error ellipsoid. are given. Based on the collection, the application of Kalman filter, α-βfilter and least square filter algorithm is simulated respectively for a certain type of radar sytem. According to the comparison of simulation results and the characteristics analysis of active defense system, the method is adopted to measure data filtering.