Abstract: Based on the meteorological data from 18 agro meteorological stations and observed data of winter wheat growth stages during 1983-2005 in North China,the change of meteorological factors and growth stages of winter wheat and the impacts of climate change on growth stages were analyzed by using statistical analysis method.The results showed the annual variations of total precipitation,sunshine hours and diurnal temperature range were not obvious,the temperature increased significantly,especially in spring and winter as well as the minimum temperature.It was no change during sowing to regreening,but it advanced at the rate of 0.46d/y and 0.27 d/y at heading date and maturity date respectively.The tread of advancing heading with latitude increasing declined.Correlation analysis showed that there was significant positive correlation between the main growth stages of winter wheat and sunshine duration and diurnal temperature range,and significant negative correlation between the main growth stages of winter wheat and temperature and total precipitation except between maturity date and its amount in May.The results indicated that the average minimum temperature increasing was the key reason to advance winter growth dates,which could provide evidence for crop production to adapt to climate change in North China.

Key words: Winter wheat region of North China, Climate change, Winter wheat growth stages