Abstract: Based on the previous researches, the longer time series about the typically anomalous snow cover years from 1957 to 2003 are confirmed initially. Using NCEP data of global monthly mean geopotential height (144×73) at 100 hPa and 500 hPa, the relationship between anomalous snow cover and atmospheric anomalous circulation at the Qinghai Tibetan Plateau is analyzed from December to next May of 1957 to 2003. And the possible mechanisms in which the atmospheric anomalous circulation affects the anomalous snow cover at the Qinghai Tibetan Plateau are propounded. It is found that the atmospheric circulation affects the weather and climate and lead to the snow cover anomaly first, and the abnormal snow cover affects the atmospheric circulation in slighter extent subsequently. The atmospheric pressure of key tropical areas changes in an opposite phase to that of key areas in the middle and high latitudes of Southern Hemisphere. Meridional circulation of two hemispheres is strengthened by this strong meridional atmospheric pressure gradient. Abnormal Antarctic Oscillation causes anomalous Mascarene high and Australia high by meridional circulation, and then they impact local meridional circulation of East Asia through meridional teleconnection which makes the anomalous climate of winter in East Asia, causing the abnormal snow cover at the Qinghai Tibetan Plateau at last. On the basis of results, a statistical method to discriminate the anomalous years of snow cover at the Qinghai Tibetan Plateau objectively and quantitatively is proposed, applying the 2 discriminant equation of the three factor optimal subset. According to the typical anomalous snow cover years given, the discriminant equation is built and argued time and again. Finally, the abnormal snow cover years from 1957 to 2003 of the Qinghai Tibetan Plateau are distinguished.