Abstract: Utilizing the ECMWF datasets for 5 winters (Dec. thr. Fed. )from 1979 to 1984,a statistical study of winter monsoons in East Asia and West-Pacific has been made. The main results have been obtained as follows:(1) There are two regions of cold surges in East Asia and West-Pacific: the East China Sea and the South China Sea,and the Western Pacific to east of Phillipines. The former area isa major area of cold surge with high frequency of activity and great intensity . The cold surge is observed below 700hPa, with the north wind at its maximum near surface and rapidly decreasing with height.(2) Accompanying the southward penetration of cold surge, the cold air may extend southward from South China across the coastal region of Indo-China Peninsula down to the near-e-quatorial region.(3) Near the surface, the activity and intensity of Siberian highs are closely related to cold surges.( 4) One may observe remarkable interannual variability of winter monsoon or cold surges in East Asia that may be associated with the interannual variability of Siberian highs and troughs on southern branch of westerlies.