An Optimal Water Allocation Model Based on Water Resources Sustainable Assessment in Shanshan Region, Northern China Li-Qin LI1,a, Xin-Min XIE1,b,*, Chuan-Jiang WEI1,c, Jun-Qiu LIU1,d,

Abstract. With the socioe-conomic development of Shanshan region, water demand is rapidly growing. To make adjustments to the water resources carrying capacity, socioe-conomic and ecological environment, this study performed an index system for the water sustainability of Shanshan region. Based on the method of membership degree of fuzzy set theory, sustainable degree and the ability of sustainable development of Shanshan are measured. Take the simulation results of optimal water allocation as actual index value. According to a multi-level fuzzy comprehensive evaluation, the result shows that the sustainable degree of Shanshan region is increased gradually with the increase of planning level years (2015, 2020, 2030). In 2030 the sustainable degree reached 0.74, which is in the higher level of sustainable development. The plan suggests that the policy of rapid socio-economic development and better environmental protection may achieve the most sustainable development of Shanshan region in the future