Based on the NCEP/NCAR daily reanalysis data during 1948—2010,this paper calculates the Atlantic storm track(AST) and the Siberian High(SH) indexes,and studies the variability of AST and its influence on SH.Results show that there are significant relationships between the longitude index(STIX) of AST and those indices describing the latitude,intensity and area of SH.When the STIX is in the positive months,the synoptic transient waves extend from Atlantic to Europe and even to the east of Mount Ural,thus intensify the anticyclone wave breaking(AWB) in Siberian and East Asian.Through the feedback of the transient waves on the monthly mean flow,the westerly is strengthened to the north of 50°N and weakened to the south of 50°N over Eurasia.The meridinal circulation in midlatitudes is strengthened,thus the ridges over the coastal West Europe and the northern Tibetan Plateau and the trough over East Europe are intensified,while the deep trough of East Asia is weakened and moves eastward.More warm air is transported to the north while the cold air from Arctic is inhibited over Siberian area,so it becomes warmer in Siberian and East Asia regions,the area of SH becomes smaller,and the SH moves southward and becomes weaker.When the STIX is in the negative months,the situation is reverse.