Abstract: To support the green development of the 'Hefei metropolitan area',it is important to clarify the current status of Liu′an ecosystem services and priority protection areas, and to assess the effectiveness of major environmental improvement projects.In this study, the InVEST model(integrated valuation of ecosystem services and trade-offs)and spatial autocorrelation technical methods were used to identify the key ecosystem services functional areas in downtown of Liu′an City(Jin′an District and Yu′an District)from 2000 to 2009 and 2010 to 2019,and priority protection areas were identified through comparative analysis.This study took Sudayan wetland as an example to analyze the effectiveness of ecological measures.The results show that forest in the south Liu′an City is the priority protection area for the ecosystem service function.Sudayan wetland project is located in the non-point source pollution and the soil conservation prevention area in downtown of Liu′an city.Sudayan wetland can enhance the ecosystem service of the site, especially the 'Pihe River green corridor' can increase the soil conservation by 49%,and achieve an increase of 54% in pollutant reduction.The 'wetland and agricultural area' will improve the total soil conservation by 36% and reduce the pollutant by 24%.