By use of Mann-Kendall abrupt change test,interdecadal abrupt climatic change of North Pacific oscillations(NPO) is studied.It is indicated that an obvious abrupt climate change occurred in 1976,and both the general circulation field and the teleconnection pattern changed remarkably before and after the abrupt change.Correspondingly,characters of wintertime weather and climate in China are also studied.Results show that before(after) the abrupt change,winter temperature in China was lower(higher) with changes in northern China larger than in southern China,and winter precipitation showed an out-of-phase character with more(less) rainfall in the middle-lower reaches of the Yangtze River and less(more) rainfall in South China.Besides,it is also pointed out that 3-year and 6-~7-year periods dominated before the NPO abrupt change,while 5-year and 10-year periods have begun to dominate after the abrupt change although 3-year period still exists.