Abstract: Based on the data of regional geology,drilling and profile,combined with 3D GIS technology,3D visualization technology and a series of description,model and analysis evaluation method of urban geological characteristics,the 3D geological model was established by 3D modeling theory,and in the 3D visualization of the comprehensive analysis of the city of sand liquefaction,the combination of urban geological work and urban planning,to create an urban 3D geological information system,improve the level of urban geological work.Taking Tongzhou area as an example,combined with the theory of sandy soil liquefaction disaster,the geological stability evaluation is carried out from three aspects,and the potential sand liquefaction disaster area in Tongzhou District area is delineated,which provides a decision-making basis for the prevention and control of disaster.