Abstract: The terrain and landform of small towns in mountainous regions are complex and changeable, and the characteristics of stormwater disasters show unique attributes. The occurrence mechanism involves multi-scale and multi-regional factors. Based on the urban resilience and sponge city theoretical studies, this research uses the quantitative and visual simulation analysis method, and from the macro-scale (city), meso-scale (town) and micro-scale (site), to explore scientific and effective methods of stormwater management. It successively selects Pengzhou in Sichuan, Longmenshan Town in Pengzhou, and the central space of Longmenshan Town as the research objects. The macro-scale sponge ecological security pattern is constructed through ArcGIS, the meso-scale water system structure is reconstructed through SWAT, and the micro-scale sponge facility regulation is implemented through SWMM. Based on software models in spaces at various scale, the results of the research have verified the feasibility of simulating rain and flood control, and have proposed multi-scale ecological strategies for flood and waterlogging prevention, which provides important reference and enlightenment for the construction of rain and flood management system in small mountain towns.