[Objective] The water resources carrying capacity of the economic belt in the north slope of Tianshan Mountain was eveluated in order to provide the basis for the development and utilization of water resources in the future.[Methods] According to the current situation of water resources in the northern slope economic belt of Tianshan Mountain, a comprehensive evaluation index system consisting of three hierarchies and 12 individual evaluation indexes was established. The weight for each evaluation index was determined based on state variable weight vector, and then the evaluation criteria and two-level comprehensive fuzzy evaluation method were developed.[Results] Comprehensive score of water resources carrying capacity of Urumqi, Shihezi, Turpan, Hami, Tacheng, Yili, Karamay, Changji and Bozhou cities was 0.41, 0.49, 0.43, 0.45, 0.76, 0.56, 0.45, 0.51 and 0.48, respectively.[Conclusion] The carrying capacity of water resources in the northern slope of Tianshan Mountain has reached a certain scale. Comprehensive measures such as water-saving technology and industrial structure adjustment should be adopted to improve the water resources carrying capacity. Rational plan and effective utilization of water resources will promote the social and economic development on the northern slope economic belt of Tianshan Mountains during the "13th five-year plan".