Abstract: In May 2023, due to the influence of heavy rainfall, Qingfeng dike and Niukeng Reservoir in Fengcheng City, Jiangxi Province, were subjected to varying degrees of peril, resulting in consequential flood damage. This research paper focuses on the analysis of this critical situation, wherein data related to the hazardous circumstances were systematically gathered. Subsequently, an inverse simulation of dike breaching inundation range was conducted utilizing hydrodynamic and remote sensing monitoring methods. Concurrently, the dam breaching risk of Niukeng Reservoir was computed and evaluated using the hydrodynamic empirical formula method. Furthermore, an on-site field inspection was executed, corroborating that the simulated dike breaching and dam breaching inundation ranges closely aligned with the actual occurrences. The findings of this study indicate a strong congruence between the simulated dam failure and the actual inundation range of the dam breach. These research outcomes furnish valuable technical references for post-disaster rapid assessments and flood emergency response decision-making in the affected region.