Abstract: The urban water is the important factor which the city forms and develops. The urban water is an important link of the whole urban water resource system, predict that the urban water is an important element task of realizing the equilibrium of supply and demand of urban water resource, make the basin to plan too, the city supports, drains off water on the foundation and basis of planning and national economic plan. This article has mainly studied the city domestic water forecast and the process water forecast computational method. And take the Fushun city as the example, respectively used dynamic correlation and the repetition use factor enhances the law has carried on the forecast to the Fushun city life and the process water, the forecast result is in 2010 the Fushun city domestic water quantity is 168.7 million tons, the industrial used water volume was 354.05 million tons. Obtains through the analysis existence main question: In order to guarantee the Fushun city water resources sustainable development, but also must add the acid resources the unification management, in comprehensively saves water in the foundation, enhances the water the effective use factor.