In this study, we verified the theory of multi-pulse coherent accumulation in the frequency domain based on FMCW coherent lidar through laboratory experiments. For echo signals with fixed pulse repetition rates, the R_SN of beat frequency signals after M-cycle coherent accumulation in the frequency domain was 10lg M dB higher than the log R_SN of the original signal, and the weak R_SN of the echo signal increased exponentially. Under the same pulse accumulation period and target detection, for the frequency modulated continuous wave whose pulse repetition frequency meets m times, the R_SN of the single-cycle high repetition frequency single-pulse echo signals was -10lg M dB higher than that of low-repetition frequency signals. With the amplitude and phase fluctuations of signals, the multi-pulse coherent accumulation R_SN was lower than the ideal coherent accumulation R_SN,and the pair mean values were 2.25×10^-4 and 1.65×10^-4 with relative amplitude fluctuations of 0.69 and 0.93, respectively, and the maximum error factors of the multi-pulse coherent accumulation R_SN of the echo signal in the 50-pulse period were 0.57% and 0.3%, respectively, which are attributed to the amplitude fluctuation of the echo signal, linear frequency modulation power and fluctuations.