Abstract: In recent years, waterlogging disasters have frequently occurred in many large and medium-sized cities in China. The surface height of built-up areas of Wuhan City (20.0~24.0 m), a typical city with frequent waterlogging, is largely below the height of flood level of the external river (23.9 m) all year round. Under regional rainstorm, the city is highly prone to urban flooding disasters. Given Wuhan’s vulnerability to urban flooding, the National Flood-Control General Office of China listed it as one of the 31 key flood control cities in China in 2013. Wuhan was included in the first batch of pilot cities in China’s sponge city program in 2015. This paper starts with the urban waterlogging occurrence mechanism, takes small watershed units (SWUs) as basic units of waterlogging risk zoning and, with SWUs, analyzes the correlation between landscape terrain elements of Wuhan (surface elevation, relief and roughness) and urban waterlogging and water accumulation density and its levels of impact, to calculate and count the waterlogging risk levels of SWUs. Based on this, it puts forward a disaster mitigation control evaluation in Wuhan. Citing Wuhan as a case in the study of urban waterlogging, it expects to provide a new way of thinking for the mitigation of waterlogging in Wuhan, which is typical and necessary.