Abstract: Based on the data of the winter wheat over-wintering stage from 1979 to 2007 and climate data of 30 meteorological stations from 1957 to 2007 in Henan Province,the trends of the climate change were analyzed by using linear regression and the trend maps of each climate factor drawed by Spline.The results showed that the duration of overwintering stage became shorter in the most areas of Henan Province,but in the areas of Zhengzhou,Fengqiu and Xuchang,the duration presented a slightly prolonging trend.The accumulated temperature above 0℃ and the sunshine hours had close relationships with the duration of the over-wintering stage.The increased accumulated temperature above 0℃ and reduced sunshine hour might shorten the duration of the over-wintering stage.

Key words: Climate change, Climate change, Winter wheat, Over-wintering Stage