Abstract: In order to remove the effect of isobaric surface uplift under the background of global warming and objectively reflect the real changes of the western Pacific subtropical high,the monthly average 500hPa geopotential height reanalysis data of NCEP/NCAR from 1951 to 2017 and the atmospheric circulation index from June to August provided by the national climate center are used in this study.Based on the WPSH characterization line after removing global warming,the changes of the Western Pacific subtropical high under the Background of Global Warming are discussed.Before/after the influence of global warming,the Western Pacific subtropical high has the evolution characteristics of the GM (increase/decrease),GQ (enhancement/attenuation) and GD (west extension/east retreat).Therefore,Global warming may be one of the reasons for the changes in the area,intensity and location of the Western Pacific subtropical high.