Abstract: Aiming at the problem of multi-rate sampling in spread spectrum systems, proposed an improved polyphase filter structure. Resampling transform can be completed in any proportion by the simple multiphase interpolation and the fractional extraction. Introduced the principle of resampling based on polyphase filter structure, proposed the architecture suitable for hardware implementation. The simulation results show that this method greatly reduces the amount of computation and overhead of the system under the premise of not affecting the performance of the system.