流域管理正在从环境及资源的单一要素管理向流域水生态系统综合管理转变，流域水生态承载力是流域水生态系统综合管理的基本理论。针对流域水生态完整性保护管理需求，建立了流域水生态承载力概念模型，提出了流域水生态承载力概念，揭示其“分区、分期”属性和“量、质、序”递进综合约束作用等基本内涵，通过分析其优化调控特性及优化调控关键变量，建立了流域水生态承载力分区耦合概念模型，形成了基于系统动力学方法的流域水生态承载力分区分期耦合模型方法，并以辽河太子河流域为例，进行了实例应用。

Watershed management is changing from single factor management of environment and resources to aquatic ecological protection integrated management. Water resources carrying capacity and water environment carrying capacity have not fully adapted to this situation. Therefore, it is necessary to build a new carrying capacity theory to solve the current aquatic problems. According to the demands of watershed water ecological integrity protection management, based on water ecological carrying capacity concept model, water ecological carrying capacity concept, which reveals its basic connotation of “partition, staging” property and "quantity, quality, order" progressive comprehensive constraint effects, was put forward in this paper. Then the paper analyzed its key optimal regulation variables, and established the water ecological carrying capacity partition coupling concept model using eco-regions as elements. Considering the communication of water flow and water quality among eco-regions, the system dynamics simulation model of Taizi River basin water ecological carrying capacity was established, the water ecological carrying capacity of 8 eco-regions were simulated, and optional regulation schemes of each eco-regions were determined， which can provide a scientific basis for the sustainable development of the watershed.