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 targets motion and thus decrease its tracking precision.As for the targets 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.