Abstract: For water resource optimization & allocation,this document is to carry out in-depth study on how to implement sustainable and stable development of economy under the condition of limited water resource aiming at solving the conflict between water resource and economy development of Beijing on the basis of domestic and foreign relevant study achievement According to induction coefficient and influence coefficient of secondary industry in input and output table,it is to search for how to improve inner structure adjustment and optimization under the condition of limited water resource with GDP(10 000RMB) water consumption of all industries,to implement balance of economic sustainable development and water resource optimization & allocation of Beijing to carry out demonstration analysis for price strategy,ration and quota strategy of different industries and to provide accurate references for water resource optimization & allocation of Beijing.