Abstract: The variation characteristics of the temperature,precipitation and sunshine on the multiple time scales and their impacts on winter wheat growth and yield in Puyang of the Henen Province was analyzed by using the linear analysis method.The results showed that the anomalous temperature in the winter abruptly changed from-0.3℃ to 0.8℃ in 1991,while the anomalous temperature in the spring abruptly changed from-0.6℃ to 0.9℃ in 1997.The climate temperature coefficient for each ten days of the 23 ten days among 25 ten days of the whole year was positive,and its maximum value was 0.42 in the last ten day in March.The cold days and cool cold days averagely decreased 4.30 days and 1.81 days for each ten years during the winter wheat growing period respectively.The phase of rainfall anomaly percentage was obvious in winter.The extreme events increased,while it reduced in spring.The changes of the precipitation tended to be moderate.The precipitation climatic trends coefficient for each ten days of the 17 ten days among 25 ten days of the whole year was positive and its maximum value was in the second ten day in January.Whereas the overall change trend in precipitation was not obvious.The abnormal sunshine in winter abruptly decreased from 0.1 in 1984 to-2.2 in 1985,while it changed from 0.3 in 1983 to-1.1 in 1984 in spring.The climatic trends coefficient for each ten days of 19 ten-day periods among 25 ten days of the whole year was negative and its absolute values were larger in the second ten days in January and the first ten days in June.It was concluded that the warming up during winter wheat growing period in winter was obvious and benefit for the over-wintering of the winter wheat.The decline of the precipitation during winter wheat growing period had adverse impacts on the stability of the winter wheat yield.The rapid reduction of the sunshine hours,particularly in the late growing period,was not favorable for the maturity of the winter wheat.

Key words: Climate warming, Climate warming, Winter wheat, Climate yield, Climate trend rate