Based on the current situations in calculating agricultural water and soil resource potential in a separated and discontinuous manner, this paper defined and constrained the conception of matching index of agricultural water and soil resource and comprehensively integrate factors related to climate, planting structure, and irrigation efficiency into a whole to evaluate the effects on regional water requirements. To resolve this problem, the paper put forward an innovative conception of calculating soil and water resources potentials, and created and defined the matching index of these two resources. Then, a multi-objective evaluation function and its constraints were used to evaluate the regional economic, ecological and social benefits. A case was studied in Hetao irrigated areas, taking 2010 as a baseline year. Comprehensive potentials and the optimal matching results of water and soil resources under RCP 8.5 and RCP 4.5 scenarios in the predicted years of 2020 and 2030 were calculated respectively. Thus a visible expression of resources utilization potential was realized for the first time. Results under RCP 8.5 and RCP 4.5 scenarios both in 2020 and 2030 showed significant increases in the economic, ecologic and integrated benefits, but social benefits were unstable. The utilization potentials of water and soil resources showed positive values, that was 0.18×10⁴, 0.04×10⁴, 0.51×10⁴, and 0.10×10⁴ yuan/hm², respectively. At the meantime, except Jiefangzha Irrigated District, the other irrigated districts all had increases in soil and water utilization potentials compared to 2010, and the per unit integrated benefits were between 0.31×10⁴-8.24×10⁴ yuan/hm².