The sustainable utilization of water resources is beneficial to ensure environment, economy and society sustainable development. In order to evaluate the sustainable utilization level of water resources in Guangxi province, the paper established the evaluation index systems of sustainable utilization including four standard layers with seventeen evaluation indexes,and used AHP method of sustainable utilization of water resources to evaluate the sustainable utilization level of water resources in Guangxi province . The result shows that the capacity of sustainable development of water resources in Guangxi is in the middle and its utilization level is basic sustainable, but the weight of utilization efficiency of water resources is too small. In order to meet the need of economic and social sustainable development in Guangxi, it is necessary to improve the utilization efficiency of water resources.