Because the near-space hypersonic vehicle's flight trajectory is unknown and its motion mode is varying during the flight, the traditional single tracking model algorithm may mismatch targefs motion and thus decrease its tracking precision. As for the target^ slippage leap maneuvering, an Interacting Multiple Model (IMM) algorithm based on CV model, CA model and sine wave model was proposed for tracking vehicles with such kind of maneuvering. The results of Monte Carlo simulation experiments show that: compared with the IMM algorithm based on CV-CA-Singer model and the IMM algorithm based on CV-CA- CA model, the IMM algorithm proposed here has better tracking performance to near space hypersonic target with slippage leap maneuvering.方向为机动目标跟踪与信息触合。