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Aiming at solving the problem of urban waterlog in Handan, Hebei Province, this study established an application model based on the twodimensional information diffusion technology and natural disaster risk assessing theory, collected the original data, including the location and waterlog history, raining intensity, danger sources and risk bearing objects of waterlogging spots which needs the supports of meteorology department, municipal drainage department and social communities. Then the assessment model is constructed, which includes the indexes of raining intensity, waterlog depth of the waterlog spots and their probably risk scenarios. The model can make the waterlog depth prediction for a certain waterlog spot with a certain raining strength input, and then can estimate the risk scenarios for each of the risk bearing objects near the spot. The study shows that the urban road waterlog risk evaluation model has a certain practical value for urban waterlog problems in plain cities.