Abstract: Based on daily precipitation data in the Huaihe River Basin of Anhui Province,the spatial and temporal changes of the precipitation at different grades and their impacts on agriculture were analyzed,combined the case studies and by using the method of particular examples,and long and short-term combination.The results showed that the chronological changes of annual precipitation,heavy rain and rainstorm were not significant,but annual precipitation days decreased and rain days over heavy rain grade were slightly increased.The summer rainfall and the proportion of rain over heavy rain grade to total precipitation also were increased.The annual and summer rainfall intensity of heavy rain and had a significantly quadric correlation with time,which tended to increase after 1990s.Crop yield had a quadric correlation with the rainfall and rain days.which correlation coefficient with rainfall was higher than that with rain days.Both the average annual precipitation and summer precipitation were higher than the optimum precipitation for high crop yield in recent years,and damage areas of waterlogging were obviously increased.

Key words: Climate change, Climate change, Different grade of precipitation, Huaihe River Basin of Anhui Province