乌东德水电站环境信息系统是利用ArcGIS Engine技术和Visual Basic开发平台，以乌东德水电站的基础地理信息、环境专业数据和属性信息为基础建立数据库，依托GIS的空间分析功能、生态环境评价规范和水质模型建立的为水利水电开发服务的环境管理与决策支持系统。系统由查询服务系统和决策支持系统2个不同层次组成，查询服务系统包括对环境信息的显示、编辑、信息检索、数据统计、空间分析等功能；决策支持系统包括生态环境评价与动态监测模块、环境影响评价模块、水污染事件应急预警模块等。介绍了系统功能的实现方法和主要研究内容。目前使用的效果证明，系统完全达到了设计的目的。

Wudongde Hydropower Station Environment Information System which serves for the hydropower station exploitation is a comprehensive software system for environmental management and decision making. The system can integrate the basic geographical database, environmental database and attributive database on the basis of advanced ArcGIS Engine, Visual Basic, GIS spatial analysis function, environment evaluation modeling method and water quality model. It consists of two parts: querying system and decision making system. Querying system has several functions such as displaying, editing, querying，searching, spatial statistics, and spatial analysis. Decision making system sets the core modules. This paper describes the core modules of the software system in detail, including main researching contents and implementing processes of modules on ecological environmental qualitative evaluation, dynamic monitoring, environmental impact assessment, water pollution emergency prewarning. It is verified by application that this system reaches the design requirements wholly.