Abstract: Aiming at the problems of low accuracy and slow operation speed of the existing linear frequency-modulated continuous wave (LFMCW) speed ranging radar, this paper proposed a design scheme of a FPGA-based optimized LFMCW radar speed ranging. First, the CORDIC parallel algorithm was optimized using the forward and reverse rotation cancellation strategy. Second, the dual−core FFT processor was designed and implemented using a combination of pipeline and parallel structures. Then, the LFMCW radar speed measuring and ranging system was completed by using the echo frequency difference and Doppler frequency shift method which calculate distance and real-time speed. Finally, by calling ModelSim in Quartus Ⅱ for functional simulation, it was proved that the data processing speed of this system was 46.5% higher than using single−core FFT, that ranging error was ±0.15 m, and that measurement error was ± 0.10 km/s.