According to the efficiency index proposed by the most stringent water resources management and the double control actions of total water consumption and intensity, the water consumptions per ten thousand Yuan GDP and per ten Yuan of added industrial values in Hainan Province are measured, and the probability of reaching the target of water use index is evaluated. The influence factors for water efficiency are analyzed. The time series method and the dynamic grey equal-dimensional model are used to predict the water use indices in 2020 and 2025, and the current annual indices are compared with the worldwide advanced ones. The results show that the water consumptions per ten thousand Yuan GDP and per ten thousand Yuan of added industrial values in 2020 decrease by 27. 7% and 36. 2% than those in the current year, respectively, and the national control target can be reached. The results may provide technical support for the implementation of the double control actions of total water consumption and intensity. Meanwhile they have reference values for the optimal allocation of water resources in Hainan Province.