Taking Jincun District of Jincheng City as an example, the strom water management model (SWMM) and integrated catchment modelling (ICM)-2D model were used to simulate the multi-scenario flooding process, and the influences of rainfall pattern and underlying surface on flooding/waterlogging were analyzed. A double-layer SWMM was constructed to simulate road flooding, and the submergence characteristics of Jincun Avenue and Jueshan Road were simulated and compared with the ICM-2D model simulation results. The results showed that with the increase of rain peak coefficient and rainfall return period, the total amount of surface flood, submerged range, and water depth increased, and the risk level increased. The time interval between the rain peak and flood peak under the same rainfall return period decreased with the increase of the rain peak coefficient. When 52.53% of the underlying surface was converted into impervious surface, the comprehensive runoff coefficient under the same rainfall return period increased by about 0.5, and the Party School section of Jincun Avenue and Shuixi Village section of Jueshan Road were the main flooding/waterlogging areas, with the submerged areas being 0.5 hm² and 1.31 hm², respectively. The double-layer SWMM has good applicability in identifying flood-prone points and deriving flood inundation factors.