Dynamic soil parameters are important for analyzing the seismic response of the soil layer,and have strong regional characteristics. The Kunming basin is a faulted basin that developed after the Late Cenozoic Era. The Pliocene to Quaternary sedimentary thickness reaches up to one thousand meters. The stratum formation is mainly composed of deposition, grade alluvial, and alluvial faces with the shape distribution of a thin layer or lens. The typical soil layer in Kunming basin consists of silt and clay soils. For a deeper understanding of the dynamic soil characteristics in Kunming basin and to conduct a seismic safety evaluation of construction sites, it is important to investigate the statistical values of the dynamic parameters such as the shear modulus ratio and the damping ratio of silt and clay soils at different depths in the Kunming region. In addition, studies are needed to compare the effects of the dynamic parameters' statistical values, norm values, and the recommended values on the soil seismic response by developing soil layer models and analyzing soil seismic responses. In this paper, we analyze the triaxial test dynamic parameters of silt and clay from 94 and 167 sample groups, respectively, collected from 101 sites in the Kunming basin region. Based on our soil seismic response calculations, we compare our results with the values recommended from Yuan Xiaoming and with those found in the code for the seismic safety evaluation of engineering sites (DB001-94). The results show that our statistical values of the dynamic parameters differ greatly from the other two sets of recommended values.The effects of different dynamic parameters on the soil seismic response are obvious and those with a lower probability of exceedance include the influences on peak acceleration, response spectra, and characteristic period. The site response analysis results of the statistical and test values are similar. The statistical values can be used for reference in work levels Ⅱ and Ⅲ for the seismic risk assessment of engineering projects in Kunming basin.