Abstract：Taking high-speed railway exploration in Harbin as an example, we use the spatial autocorrelation method to extract microtremor signal dispersion characteristics, then obtain shear wave velocity structure of the underground 150 m medium and its layering features. The results show that the microtremor method can penetrate thicker overburden to detect the bedrock surface, and the formation interface is consistent with the borehole data. This method has convenient construction and strong applicability. Combining it with drilling data, we can accurately describe the underground geological horizon distribution and reduce the drilling workload. It saves economic costs and has high application value and scientific significance.