Abstract: Water resources play a pivotal role in sustainable development.However, rapid urbanization threatens water resources.Therefore, water resources should be quantified and appropriate measures should be developed for their protection to achieve sustainable development in regional areas.A DPSIR framework is used in this paper to assess the carrying capacity of water resources in the Liangzi Lake Basin and to spatially locate the results of the assessment.Using the evaluation results as a foundation, a FLUS model is employed to simulate future development trends, delineate the functional advantage areas of the region's land and space, and determine the water environmental protection pattern of the Liangzi Lake Basin through comprehensive assessment and simulation of the results.We construct a practical and feasible planning and technical pathway for territorial space and water resources protection of watersheds, based on two aspects of quantitative measurement and scenario simulation.This approach can provide valuable references for territorial space planning and ecological protection in the guidance of regional water resources protection objectives.