Vector tracking is one of the key technologies in deep integration research.The traditional receiver tracking loop uses scalar tracking mode, under which the receiver loses satellite signals easily in high dynamic environment and suffers electromagnetic interference easily in weak signal environment.Centralized deep integration uses vector tracking algorithm.However, it is difficult to realize in engineering applications due to the highly nonlinear relationship between the measurements and state variables.Considering the above situation, a method of vector tracking algorithm suitable for cascaded deep integration is proposed.By analyzing the relationship between each tracking error and the discriminator output, a prefilter dynamic model is built up.The simulation results show that, compared with scalar tracking algorithm, the vector tracking algorithm based on prefilter has better tracking performance of code and carrier frequency in high dynamic environment.