Abstract: Cross-regional flood control scheduling involves a wide scope, numerous water projects, and complex interrelationships, making traditional single-project scheduling insufficient to meet operational needs. To address this, this paper proposes a coordinated scheduling model for cross-regional water projects that integrates "reservoirs, rivers, sluice gates, and flood storage and detention areas." By decomposing various types of water projects into corresponding scheduling modules, local water projects are solved using both rule-based scheduling and optimization-based scheduling, with coordination among modules enabling the collaborative operation of multiple water projects. The model is applied to the Daqing River Basin. The results show that, compared with rule-based scheduling, solving the coordinated scheduling model using the NSGA-Ⅱ optimization algorithm significantly improves the peak shaving capacity of the four major reservoirs in the South Branch of the Daqing River, effectively reduces the inflow peak discharge and maximum water level of Baiyangdian Lake, lowers the water level from 10.68 m to 9.22 m under extreme flood scenarios, and optimizes the flood diversion volume allocation among flood storage and detention areas. The model can provide support for improving the overall flood control efficiency of complex flood control systems.