An information fusion method based on the combination of BP neural networks and D-S evidence theory to recognize satellite and its companion decoy in the state of point target is proposed in the paper. A BP networks is adopted to recognize the patterns with the characteristics of infrared(IR) radiation at first, then the D-S evidence theory is used to fuse the results derived from the BP networks at different time. The result of emulatson shows that the true rate of D-S is much higher than BP, and the ability to reject disturbance and noise is raised very much.