The key to guarantee the sustainable development of Wetland ecotourism is to control the amount of tourists to wetland parks reasonably. Eco - tourism carrying capacity means within a certain period of time and range, the maximum number of tourists that the tourism destination can host, under the premise of not hurting the natural human environment, socioeconomic development of the tourist destination, and ensuring the quality of the tourists' feeling. This essay comprehensively calculated the Eco - tourism carrying capacity of Xiazhuhu Wetland Park by synthesizing the aspects of ecological carrying capacity, spatial carrying capacity, facility carrying capacity, management carrying capacity and psychological carrying capacity.