Activity of blocking high over Eurasia continent is examined according to data of 500 hPa geopotential height and zonal winds for the period 1950—2004,which are provided by NCEP/NCAR.Results show that blockings in Eurasia posses distinct seasonal variations and geographic diversities.In spring blockings occurred frequently over the Ural Mts.In summer blockings occurred frequently over four regions,namely the Ural Mts,West of the Lake Baikal,East of the Lake Baikal,and the Sea of Okhotsk.Much fewer blockings occurred in autumn.In winter most blockings occurred over around the Ural Mts.The occurrence frequency of blockings over the Lake Baikal in summer accounts for 69 percent of its annual total.There is an intraseasonal variation of the occurrence frequency of blocking in Eurasia with a significant period of 30—60 days as well as eastward propagation of the blocking high centers in summer.In addition,blocking activities have significant interannual variations,which behave differently in various areas.