Abstract: Shenzhen Municipal Water Affairs Bureau advance planning, careful organization and implementation of the Shenzhen River Basin water works group joint scheduling, successfully prevented the "2023.9.7" extremely heavy rainstorm in Shenzhen, guaranteed the safety of flood control in the Shenzhen River Basin, especially in Luohu and Futian districts in the central city, and effectively reduced the loss of flood disasters. By comprehensively reviewing the joint scheduling process of water projects in the Shenzhen River Basin under the extremely heavy rain conditions of "2023.9.7", sorting out the severe situation faced by the scheduling process, analyzing the joint scheduling methods and effects of water projects such as Shenzhen Reservoir and Sungang Flood Detention Area at different stages of rainfall development, exploring the constraints in the joint scheduling process, proposing countermeasures and suggestions, and providing reference for optimizing the joint scheduling work of water projects in the Shenzhen River Basin.