本文总结了CIC 滤波器理论要点，介绍了采用FPGA设计CIC 滤波器的基本方法，使滤波器的参数可以按实际需要任意更改，给出了仿真结，验证了设计的可靠性和可行性。采用该方法设计的CIC 滤波器已用于DDC芯片，也适合下一代高频雷达系统的要求。-This paper summarizes the main points of CIC filter theory, introduced the CIC filter design using FPGA basic ways in which filter parameters can be arbitrary according to the actual needs change, the simulation node to verify the reliability of the design and feasibility. Designed using the CIC filter has been used in DDC chips, also suitable for the next generation of high-frequency radar system requirements.