Abstract: Based on the drainage system of the urban comprehensive drainage basin, the simulation of rainstorm was carried out in the drainage area of the shallow mountain area in Guangzhou city by building a regional flood hydrological model, and the flood risk study was carried out. The evaluation results indicate that the flood risk level after the development of the project scope is relatively low. Based on the evaluation conclusions and suggestions, strictly adhere to the requirements of the river planning control line and management scope line, implement the control of regional flood and drainage facilities and sponge storage space, develop reasonable vertical elevation control and rainwater engineering plans, ensure the safe and reasonable development of the area, and ensure the sustainable use and resilient safety of urban land resources. The study can provide experience and reference for land adaptability assessment of land types such as shallow mountain areas in Guangzhou City.