Abstract: In this paper,a set of hydrological forecasting and information displaying software system of Haihe area is introduced.Based on computer graphic technology and database technology and by using client/server system structure,this system gets basic data from remote server database,has the abilities of rain/water regiment analysis,flood forecasting,querying information of water regiment forecast,geographic distribution information querying （electric map querying）,graphic displaying and printing, help,and so on.By using this system,we can forecast the water regiment of Haihe area in time and exactly,query information,display analysis by graphic,forecast result.The user interface of this system is friendly and can be used conveniently.