General circulation features over the Northern Hemisphere in 2005 are analyzed. It is shown that the 500hPa subtropical high over the West Pacific is stronger than normal. Its position is westerly and northerly as a whole. Its ridge point is abnormal to the west in spring. At 500hPa, zonal and meridional circulations take place by turn, cold air is stronger than normal during the winter. Monsoon is stronger during the summer, convection activity is weaker during the winter and the spring, and into the summer is stronger in tropics. A warm water process is persisting in the tropical Pacific region in 2005. The anomaly of both the tropical Pacific and atmospheric circulation exerted a significant impact on the weather and climate in China.