Abstract: Based on the Chinese-Windows enviroment and utilized the object-oriental programming,the real-tine flood control system consisting of Baishan and Fengman Reservoirs is successfully designed and devel oped.The system,which has the advantage of flexible man-computer interface and abundant information,can retrieve,process the rainfall data from the remote sensing rain gauges,forecast runoff and produce,compare and select the system operational ternatives.The system rules of design and development,and some key technolgy,which may be benefical for designing other flood control systems,are introduced briefly.