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Aiming at the application requirements of the same signal receiving front-end in different bandwidth operating modes of radar system, an efficient DDC design for multiple bandwidths was presented. The mixer is designed with a quadruple IF sampling technology, and the filter was designed with a parallel decimation and multi-level filtering. The structure of filter was designed for different bandwidth digital signal filtering according to performance of radar in different operating modes. The DDC design example with three operating modes was presented based on the Xilinx FPGA design platform, and the reasonability of the design method was verified through experimental data analysis.