Taking Pinglu Swan Scenic Spot as an example, the supply-demand relationship of cultural ecosystem service (CES) was assessed. The supply of CES was rated by the annual capacity of tourist reception, and the demand was calculated through importance value acquired by questionnaire. The results were showed as follows. 1) The overall demand of CES was positively correlated with GDP per square kilometre and population density, meanwhile it was also related to the understanding of CES. However, it had no relevance to distance. Owing to continuous loss of biodiversity from global climate change and human activities, the demand for bird-watching service, aesthetic value and existence value were relatively high, which suggested that people attached much importance to the biodiversity conservation. 2) The supply capacity of CES of Pinglu Swan Scenic Spot was generally higher than the overall demand, so the demand was the chief factor that affected the supply-demand relationship. The supply-demand matched areas were distributed in Xi’an City and Zhengzhou City, while the other 13 cities demonstrated a mismatched relationship. Enhancing the propoganda and education, as well as improving traffic service of Pinglu Swan Scenic Spot will raise demand so as to narrow disparities between supply and demand of CES. The results provide data support for environmental planning and management of wetland resources.