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Serious water situation, carry out urban water conservation work , ease urban water crisis has become a matter of national modernization and social harmonious development of the urgent problem. The traditional urban water conservation work has some limitations . This study aims to create a set of comprehensive urban water planning methodology for China's urban water conservation work and decision-making to provide strong technical support . This paper analyzes the structure of urban water systems and related planning, water-saving technologies , water management and planning , etc., of the city of benign water cycle analysis concepts and requirements - healthy natural water cycle water cycle and efficient social good match . As the basis for its proposed comprehensive urban water planning concepts. Reference and comparison , a comprehensive analysis of existing relevant planning methods , the creation of the city's comprehensive water conservation planning methods and procedures . Established a multi- source multi-user quality and quantity of supply and demand balance analysis as the core of the city's comprehensive water conservation planning methodology framework , including status evaluation step , targeting, scene design, potential analysis , equilibrium analysis , countermeasure implementation. According to the requirements of the city's comprehensive water conservation work , both data and functions from the platform needs analysis . Underlying database designed by the city , the city water system databases and spatial database consisting of database structure. Design , including map display, data management and maintenance , water situation analysis, evaluation and other water-saving horizontal portion of the functional structure . As a case in Daxing District , the city's comprehensive water conservation planning application methodology , a comprehensive water conservation planning studies . Recommended scenario, in 2015 and 2020 , the amount of water were 8.06 × 10 ~ 6m ~ 3 and 2.076 × 10 ~ 7m ~ 3, the amount of recycled water conservancy were 1.263 × 10 ~ 7m ~ 3 and 1.961 × 10 ~ 7m ~ 3 conventional and unconventional water sources have reached the supply and demand balance . And for the recommended scenario of water saving potential and the potential countermeasures and suggestions were put forward , including the implementation of water saving potential countermeasures domestic, industrial , environmental and leakage four parts. Water potential measures include the use of reclaimed water and rainwater utilization, identify the main potential users of recycled water , and construction investment objective function is optimized to obtain the best economic solution recycled water service .
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