Abstract: The performance of the "current" statistical model algorithm gets worse when there is a sudden maneuver.To solve this problem,an improved algorithm is presented.This algorithm is implemented through a pair of parallel adaptive filters together with information fusion technique.By introducing the state information of targets,the output of the fuzzy system can adjust the predicted covariance of the filter adaptively.The simulation results show that the proposed algorithm has better performance when there is a sudden maneuver.