Considering the new model of large-scale water diversion and supply across regions and river basins under the pattern of water network connectivity, to coordinate the sustainable development of resource, economy, and environment in Ordos City, alleviate the uneven spatial distribution of water resources, and deal with the problem of water competition between energy and grain, typical areas of Ordos City, including Dongsheng District, Kangbashi District, Dalad Banner, Uxin Banner, and Ejin Horo Banner were taken as the study area. Based on regional social and economic data, with 2023 as the status-quo year, NSGA-Ⅱ was adopted to construct a multi-source, multi-user, and multi-objective optimal allocation model to conduct research on water resources allocation for future planning year(2030) under normal and dry scenarios. The results show that in 2023, the supply proportions of groundwater, Yellow River water, surface water, reclaimed water, and dewatering water were 60%, 15%, 5%, 6%, and 14%, respectively, indicating a primary reliance on groundwater and low utilization rate of other water sources. The volumes of water allocation under the normal water scenario (frequency of 50%) and dry water scenario (frequency of 75%) in 2030 are 723.191 5 million m 3 and 719.972 8 million m 3, with water shortage rates of 8.00% and 10.21%, respectively. Under all scenarios, the regional water allocation meets the demands for domestic, ecological, and industrial water uses, while agriculture experiences varying degrees of water shortage, especially in Dalad Banner under the dry scenario, where the agricultural water shortage rate reaches 23.26%. The supply proportions of various water sources under the normal scenario in 2030 are 29%, 25%, 14%, 11%, and 21%, respectively, and data under the dry scenario are 32%, 24%, 12%, 11%, and 21%, respectively. Compared to 2023, the proportion of groundwater supply in 2030 decreases, while the proportions of other water sources increase, indicating a significant optimization of water supply structure and a significant improvement in water use level.