Abstract: In order to analyze the impact of random wheel-rail irregularity on the vibration reduction effect of steel spring floating slab track (SSFST), the random simulation method is used to study the random characteristics of random wheel irregularity on the evaluation results of insertion loss (IL) of SSFST under different track irregularity states, and the influence of track irregularity development on the evaluation results of IL. The research results indicate that under different track irregularities, the difference of IL on the tunnel wall VL_Z,max induced by random wheel irregularity is more than 10 dB discrete, and as the track irregularity develop, the sample mean and standard deviation of the IL of VL_Z,max significantly decrease. The statistical results of frequency division IL show that the development of track irregularities has a more significant impact on frequency division IL under 6.3 Hz, and that the impact on the statistical mean of frequencies above 20 Hz is not significant.