Aiming at disadvantages of heavy computational of interacting multiple model particle filter(IMMPF) algorithm,an interactive multiple model tracking algorithm based on multirate tracking method(MRT) is proposed.The mixed filter between pattern space and measurement space is achieved,and the data is updated at a different rate according to the manoeuvrability of each model.And,each model marches different filter: the poor-maneuver model matches Kalman filter and the strong-maneuver model matches the particle filter.The simulation results show that the computational costs of this algorithm is reduced significantly by a factor of 38.9% compared with that of traditional IMMPF algorithm,with comparable tracking performance to IMMPF.It can improve the real-time performance and reliability of optoelectronic target tracking system effectively.