Abstract: In this paper the wind and temperature changes over Eurasia during the active,break and withdrawal time periods of the summer monsoon of 1979 is studied.It is shown that the active monsoon regime was characterized by the distinct northward shift of the upper westerlies,establishment and development of upper anticyclonic circulation around the Tibetan Plateau,and development and persistance of blocking high over the western Soviet Union.The break monsoon regime was enhanced by the presence of upper trough over the western part of the Tibetan Plateau and the decay of blocking high or development of a trough system over the western Soviet Union.