According to the daily meteorological data from 11 stations in Dezhou city from 1971 to 2014,using the methods of 5 - day sliding mean,experience frequency,and the linear trend estimation,this paper analyzed the initial and final dates,duration,accumulated temperature,80% guarantee rate of the daily temperature above 0℃ stably,and the impacts on Grain crop. The results showed that the initial date was in advance 4.12 days per 10 years,which mainly concentrated in the mid to late February. The final date delayed 0.27 days per decade,which mainly concentrated in early December. The duration increased 4.39 days per decade,the average number of days was 288. The accumulated temperature above 0℃ increased 117.2℃ per decade. The range of initial date of stability with 80% guarantee rate of the daily temperature above 0℃ was from March 1st to 6,the range of final date was from December 9 to 17,the range of accumulated temperature was between 4939.7 ℃ and 5295.4℃. The climate change increased the local heat resource,prolonged the summer corn growth period,delayed winter wheat appropriate seeding time,promoted the mature period in advance,and shortened the number of days in the whole stage. So it put forward that it needed to comprehensively analyze the effects on the crop grain.