Abstract: The small-strain soil hardening model (HSS model) takes into account the small-strain characteristics of the soil. In terms of simulating and predicting the deformation of underground engineering with strict deformation control standards, the numerical analysis using the HSS model has high accuracy and usually agrees well with the measured data. Therefore, the HSS model has been widely used, but it is difficult and troublesome to select the parameters, and most of them are empirical values at present. The researches on the parameters of HSS model for soft soils has accumulated a certain amount of results, but there is still a need for further enrichment. In this study, the existing test results are summarized and statistically analyzed, and the value range or proportional relationship of the failure ratio, reference modulus and small strain parameters of soft soil are obtained, which may provide empirical reference for engineering applications.