Abstract:The supply and demand of ecosystem services has a profound impact on the regional ecological security and the sustainable development of economy and society. In this paper, Beijing-Tianjin-Hebei Region is taken as the research area. Relying on the selected three ecosystem services, that is, water yield, food and carbon storage, this paper conducts measurement for the supply and demand of ecosystem services in the Beijing-Tianjin-Hebei Region in 2005 and 2015 through using the InVEST model and ArcGIS spatial analysis tools. On this basis, it explores the evolution characteristics of supply and demand typological areas of ecosystem service in the Beijing-Tianjin-Hebei Region. The results show that (1) the ratios of supply and demand of water yield services in Beijing-Tianjin-Hebei Region in 2005 and 2015 were -0.65 and -0.59 respectively, indicating that the supply and demand of water yield services were in deficit in these two years. The ratios of supply and demand of carbon storage services in these two years were 0.34 and 0.12 respectively while the ratios of supply and demand of food supply services in these two years were 0.07 and 0.03 respectively, indicating that the supply and demand of these two ecosystem services were in surplus. Meanwhile, the spatial heterogeneity of supply and demand of various ecosystem services was significant from 2005 to 2015. These results prove that the status of carbon storage services and food supply services in Beijing-Tianjin-Hebei Region is excellent, but the status of water yield services is not optimistic. In the future, the water shortage situation in the Beijing-Tianjin-Hebei Region may become more obvious. (2) The comprehensive ratios of ecosystem services supply and demand in Beijing-Tianjin-Hebei Region in 2005 and 2015 were -0.09 and -0.16 respectively, indicating that the supply and demand of the Beijing-Tianjin-Hebei Region in these two years were in deficit. The main deficit range was in a circular distribution centered on the Beijing-Tianjin-Hebei Region, and the range was expanded during this period. It also indicates that the overall ecological supply and demand situation in Beijing-Tianjin-Hebei Region may further deteriorate. (3) Based on the supply and demand of ecosystem services, the counties in Beijing-Tianjin-Hebei were divided into ecological conservation area, ecological protection area, ecological improvement area, ecological restoration area and ecological control area, each type area has its own characteristics of supply and demand. According to the situation of supply and demand of each ecosystem type and the law of its temporal and spatial evolution, this paper puts forward the corresponding policies and suggestions.