Pointing at observation and processing of the radar target, these are finished in different coordinate systems, and in order to track the maneuvering target, a federated filter algorithm of maneuvering target track is presented in this paper. This algorithm is based on the Kalman filter and the algorithm in rectangular coordinate is combined with the algorithm in polar coordinate. The shortages of the algorithms with the two coordinates are overcome and the tracking effect on the maneuvering target is very good. The simulation experiment results show the effectiveness of this algorithm.