Abstract: Aiming at tracking highly maneuvering target, the improvement of the model set for the interacting multiple model(IMM) algorithm was investigated. A IMM algorithm, introducing CS-Jerk model, was proposed in this paper, as for the S maneuvering target, it adopted the constant speed model, turn model and the CS-Jerk model to interact, the issue about the rate of acceleration change in S maneuvering was soveld, meanwhile, it was compared with the IMM algorithm of CV-CT and the IMM algorithm of CV-CT-Jerk.. It demonstrates that this method shows the superiority in tracking high-speed, high-motor target through the Monte-Carlo simulation, indeed, it further validates the feasibility and effectiveness of this method and has certain significance in researching high maneuvering target tracking.