Abstract: The work is a part of the study on the Yongtze River Flood Control Decision System. According to the special requirement of the project, the character of the Database and Information Query System of Decision Support System for the flood control and research methods are carefully analyzed, the advanced method of system development and visual program making software are used for this purpose. The Database of Water Regime and Water Resources Projects are established on the Windows Workstation in microcomputer, the part of the Information Query System is designed, and the program is made. The Database and Information Query System developed are such subsystem that they can be used for a large number of data and complicated relationship in the data. The data formats are in conversion and the constructions of these systems are reasonable. These subsystem are easy to use, maintain and extend.