Abstract：Quaternary investigation, which serves the urban geological investigation and aims at constructing 3D geological structure, has great exploratory potential. Take Hangzhou City for example, the paper explores and summarizes the methods and technical specifications for the 3D Quaternary structure investigation in the plain region of the city with respect to Quaternary standard hole construction, collection, compilation, analysis and selection of a mass of borehole data, shallow seismic exploration and composite well logging, stratigraphic division of the Quaternary and hole profile correlation.