Based on the NCEP/NCAR reanalysis data and air temperature data of the 160 stations in China,by using harmonic analysis,correlation analysis,singular value decomposition and others,the interdecadal and interannual anomaly features of winter Siberian High(SH)and their impact on winter temperature of China are investigated.The results are as followings:(1)On the interdecadal time scale,SH became weak and shrank after the late 1960s,with its east edge retreating to the west and its south edge backing up north.Since the 21st century, the area of SH has a trend of expansion.On the interannual timescale,the area of SH gets the maximum interannual variance.(2)The interannual variability of the intensity and area as well as the east edge of SH have gone up since the beginning of 21st century.On the interdecadal timescale,starting around 1975,the interdecadal variability of the whole SH feature variables all turned smaller than before.(3)SH in colder winter years of China is more powerful,along with the expansion to the east and south,the corresponding anomaly pattern like EU positive phase in the 500 hPa height field and the enhanced Eurasian ridge play a key role in the development of SH,and vice versa.When SH strengthens and enlarges with its frontiers sweeping eastward and southward on interannual timescale,then the intensity of SH makes the most impact,leading to the cold winter in most parts of China,especially in the South,and vice versa.However for the interdecadal scale,the area of SH has the greatest influence on winter temperature.When the SH becomes strong(weak)and expands eastward(retreats westward),the temperature in the land to the north of the Yellow River turns lower.(4)When there are great(small)variations in the interannual intensity and area of SH,and the interannual variability of its east edge and south edge is at low(high)level,as a result,the interannual fluctuation of temperature in most parts of China is sharp(gentle).On the interdecadal scale,When all the SH feature variables'interdecadal variability increases(declines),consequently the interdecadal undulation of winter temperature in north and northeast China gets large(small),while the interdecadal fluctuation of winter temperature in the south is reduced(increased).
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