Abstract: The study aimed to investigate how to influence the intensity, its edge of the polar vortex to the stratospheric warming on the troposphere in relation to global warming. The edge of polar vortex was defined by averaging wind component at 450K potential temperature surface along 60°–65°N during the winter using reanalyze ERA5 data. The results revealed that, recent years, decreasing linear trend of polar vortex 2m/s per decade (p < 0.1) was found during the study period (1979 – 2019). In addition, we found that the edge of polar vortex has more impact than the inter-annual polar vortex changes on the winter climate of Mongolia.