水量短缺及水质污染已成为首都经济社会发展与生态环境改善的关键制约因素。针对北京水资源和水环境现状，通过水质水量联合调度高效配置城市水资源，利用生态修复和河湖改造工程等综合防治技术，改善北京城市水环境的质量，对首都社会经济的长远发展极为重要，也是创办生态奥运的基本条件。目前，北京城市水系中主要存在着以下问题：一是水量短缺，从2001年到2004年，研究区来水量从1438.47万m3降到717.3万m3，仅能维持河湖蒸发、渗透；二是城市水体污染严重，而且有恶化的趋势。其水质问题主要是有机物污染和富营养化，主要污染因子包括：总氮和总磷、CODMn，水质多为V类（GB3838－2002）。三是水生生态系统不完整，研究区自1999年来，每年都会爆发水华，对城市水系生态健康和景观娱乐造成严重影响。对研究区水质数据进行主成分分析结果表明，营养盐负荷过多为水体富营养化的主要原因，研究区河流富营养化类型为磷限制型，湖泊为氮限制型。因此，保证研究区最小生态环境需水，控制水体”水华”的爆发，进而恢复水生生态系统的完整性, 并改善由目前的Ⅴ类、超Ⅴ类水体恢复到Ⅲ～Ⅳ类水体水质标准成为本文研究的主要目标。为达到上述目标，首先提出了生态环境需水理论和生态系统管理理论；针对研究区存在的主要问题，计算了研究区生态环境需水的水量、水质要求；同时，构建了水量模型、水质模型和水华预警模型，在此基础上，进行了水量、水质联合调度方案库的设计，对方案从水量、水质、水生态，费用角度进行了优选，提出了短、中、长期水量、水质的联合调度方案，通过对研究区水量、水质的联合调度，能达到优化水环境质量改善技术，使示范区水体水质总体上明显改观，河湖水体的景观生态功能得到强化。

Water scarcity and water pollution are bacis confined factors for economic development and eclogical improving of Beijing city. Aim at the status quo of water resources and enviroment of Beijing city, it is very important for economic and social development of Beijing city and for successful holding green Olympic games in Beijing city to improve the quality of water environment by water resources management of integrated water quantity and water quality method and by ecological rehabilitate of city rivers and lakes.At present, the following problems are existed in water system of Beijing city: one is the water scarcity, the inflow of research area per year decrease from 1438.47*104m3 in 2001 to 717.3*104m3 in 2004，which only can satify the evaparation and leakage of research area; the second is the water pollution, especially organically pollution and eutrophication, the main pollution factors are total phosphor, total nitrogen and CODMn and the water quality is above class V according to chinese water quality criterion(GB3838－2002); the third are the structure and function absent of water ecological system. The water algal bloom have happened since 1999, which bring secious negative impact for ecological health and landscape endangered in water system of research areas. The principle method of water quality data of research areas indicated that the overload of nutriment is the main cause of water eutrophication. That of river is phosphor-confined type and that of lake is nitrogen-confined type. So the main goals of the paper are guarantee the minimum ecological water demand; controlling water algae bloom and rebacking the integrtal of water ecological system, and imroving water quality from class Ⅴto calss Ⅲ.To reach such targets,the ecological water demand theory and ecological system managemental theory are firstly persented. The water quantity and quality demand of ecological water use are then calculated. Secondly, Based on water quantity models, water quality models and algal bloom predicted models, the water quantity and quality managemental scenarios were design and simulated. And the short time, the middle time and the long time recommend optimized scenario are achieved by constrast the water quantity, the water quality, the water ecosyetem and cost indexes of diferrent simulated results. Through the optimzed scenario enforcement, the water quality of research area will improve and landscape ecological functions will be inforced.