Abstract: It is known that CIC filter has been commonly used for sampling rate transforming in digital signal processing, and that some defects of traditional CIC filter exist in practical applications. However, the multi-level cascade connection of CIC filters can decrease the requirement of hardware for real-time processing; the Cosine filter improves the deficit of stop-band attenuation; the Interpolated Second-Order Polynomial filter compensates the attenuation of CIC filter in pass-band and the Anti-alias Low Pass filter reduces the influence of aliasing. The feasibility of FPGA hardware platform is verified by simulation.