Abstract: Along with rapid change in global climate and fast development in urbanization, the frequency of urban waterlogging events becomes increasingly higher. Dongguan is located in the Pearl River Delta, a region of high-level economic development that is vulnerable to attacks by storm surges and high level floods in its outer rivers. Hence, waterlogging threat to this city is becoming increasingly higher and its waterlog control requires a storm water model for evaluation of its existing drainage capacity and risks of waterlogging. This study coupled LISFLOOD-FP (a 2D hydrodynamic model) with SWMM (a 1D model for a drainage system) in simulations of rainstorms and waterlogging over a study area covering typical regions of Dongguan and obtained following conclusions. By constructing a SWMM model and coupling SWMM and LISFLOOD-FP for the city, we simulated the inundated area of waterlogging and its water depth. Verification with the measured rainfall data of 13-6-2008 rainstorm shows that this coupling model was effective and satisfactory. Then, the model was used to simulate the design rainfalls with return periods of 0.5, 1, 2, 5, and 20 years. Results indicates that as the return period increases from 0.5 to 20 years, the discharges are increased at outfalls, overflow discharges, and the number of flooding nodes in the study area, and the floods have earlier peak flows and longer durations. And the inundated area increases from 0.92 to 1.93 km2, with a portion of 0.02 to 0.25 km2 subject to flooding deeper than 2m. In the study area, high risk waterlogging covers Dongzong road, Dongchengxi road, Yinshan street, and Donghui road.