During the construction of sponge city, geological conditions always have an important influence on choosing suitable low impact development (LID) facilities. Based on the metropolitan development area of Wuhan City, the mechanism that geological conditions influence the construction of sponge city is analyzed through processing of the urban geological survey data. According to the abilities of water storage, seepage and purification, seven factors, including surface slope, formation lithology, Quaternary thickness, volume of groundwater, extent of soil contamination, vegetation cover rate and distance from the surface drainage, are chosen to build the evaluation systems. Each factor is weighted with the analytic hierarchy process, graded according to national standards or the situation in the study area, and stacked with Mapgis. The results show that most areas are suitable or comparatively suitable for sponge city construction. Formation lithology and the distance from surface drainage are two important influence factors, and the abilities of water storage and seepage should be also taken into account in deployment of low impact development facilities in sponge city construction.