Abstract: In order to resolve crisis of water quality scarcity and improve water ecological environment,a multi-objective water resources quantity and quality integrated allocation model is established,based on the system decomposition and coordination theory and the principle of“allocation in supply,quality by demand,supply by quality”. At user layer,demand schemes under different water frequencies are obtained by multi-objective function and simulated annealing algorithm. At source layer,demand schemes are obtained by linear objective programming and high-quality water and general-quality water are allocated according to water requirements of demand schemes. According to the target benefit,three kinds of water supply schemes are obtained under different conditions. In a particularly dry year,the ecological benefit of the ecological scheme exceeds that of the economic scheme by about 1,the economic benefit of economic scheme is 0.63 higher than that of ecological scheme,and the total benefit value of balanced scheme is 0.23 and 0.78 higher than that of other schemes. This paper explores the water supply planning and comprehensive benefit evaluation in the optimal allocation system of water resources,and provides a reference for the green development of regional water resources under the background of ecological civilization..