Abstract: A comprehensive understanding of the coupling mechanism between ecosystem services supply and demand at the watershed scale is an important pathway for coordinating the contradiction between the development and protection of water resources of stakeholders across different scales in the watershed and promotes the ecological protection and top-level design of ecological civilization. Here, we mainly focused on three issues: connotation and scale-related characteristics of ecosystem services supply and demand; coupling mechanisms between ecosystem services supply and demand; major factors affecting coupling mechanism of ecosystem services supply and demand and research methods on connecting ecosystem services supply to demand for guiding ecosystem management. Scientific and technology support, financial mechanism, and monitoring platform are key to maintain the integrity and naturalness of river and lake ecosystems, improve river and lake ecosystem services supply, coordinate the spatial coupling between river and lake ecosystem services supply and demand, and promote the harmonious development between socioeconomic development and ecosystem protection. In the future, we should strengthen the accumulation of primary data and construction of ecologicalproduction functions to improve the scientific and reasonable prediction of ecosystem services supply and demand, providing scientific basis for the formulation of management measures such as ecological compensation.

Key words: redundancy analysis, Yueqing Bay, niche overlap, niche breadth