Abstract: Reasonable collocation is based on the regional water resource collocation. Reclaimed wastewater use potential respective for urban water body, municipal and household, industry, agriculture is 0.423, 0.216 ,0.205 ,0.56 billion cubic meter.In 2010 Beijing will use 0.6 billion cubic meter of reclaimed wastewater in different industries to make water balance, effluents by tertiary treatment and secondary treatment are 0.109 and 0.491 billion cubic meter respectively, the respective amount of reclaimed wastewater use for, municipal and household, industry, urban river and lake agriculture is 0.03234, 0.148, 0.1025, 0.3 billion cubic meter.