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水资源－－环境系统的复杂性和非结构化问题给合理地进行水资源－－环境管理与决策带来了很大的困难。在简要介绍地理信息系统的基础上，重点阐述了用于解决复杂系统非结构化问题的水资源－－环境管理决策支持系统（ＷＥＤＳＳ）的组成与功能，以及水资源－－环境管理决策支持系统的国内外研究现状和发展趋向。ＷＥＤＳＳ是由数据库、模型库、知识库和用户界面组成，可以充分有效地利用庞大的各类信息。以往由于不同软件之间靠接口联接，运算速度较慢，目前新的紧密联接的决策支持系统正在开发研制之中。
The complexity and unstructured problems of water resources and environmental systems have brought great difficulties to the rational management of water resources, environmental management and decision-making. On the basis of a brief introduction of GIS, the composition and function of WEDSS, which is used to solve the unstructured problems of complex systems, and the water resource - environmental management decision support system The research status and development trend at home and abroad. WEDSS is composed of a database, a model library, a knowledge base and a user interface that make full and efficient use of a vast variety of information. In the past due to the connection between different software interfaces, the computing speed is slow, the current close joint decision support system is being developed.