Abstract: Jingjiang flood diversion area is designed to diverte flood when the flood exceeds the safety flood discharge in Jingjiang part of the Changjiang river for insuring the satety of Jingjiang Great Embankment, Jianghan Plain and the city of Wuhan. It contributes continually to prevent or control flood, so we try to build an information system to manage and demonstrate that the area can supply effective information for decision\|making in preventing flood. This paper analyzed the deficiencies of requirement analysis and information organization during the period when we built the information system according to usual thought. After that we did lots of detailed preparing jobs, such as analysing users' requirement and preprocessing data. We then organized abundant data, designed and realized database. After designing the system by prototype method, we developed the information system for Jingjiang flood diversion area by Visual Basic 6.0 and Mapobject, which have many functions required by users. The system unified basic information of Jingjiang flood diversion area, which reflects the characteristic and significance of the area. We think small and effective system would be better, which satisfied the requirements of Engineering Management Bureau of Jingjiang Flood Diversion Area.

Key words: Jingjiang flood diversion area, geographio information system, system analysis, information organization