Abstract: In the light of the actual situation of shortage of water in Guanzhong District．taking the Jinghuiqu irrigation zone as an example and on the base of investigation and systematic analysis，an information management decision supporting system in large irrigation zone has been built．At the same time，the analysis and research have been expounded the object arid principle，the structure of GIS software，ensemble structure and function modules and the process of design of the system，providing a decision support and theory base for the related departments and manager．