Abstract:

Abstract: In this paper，the change and trend of the decadal average annual precipitation, the seasonal precipitation，large precipitation (the amount above)，short of heavy precipitation during the period from May to September ,maximum one day in Datong. The results showed that: annual precipitation undergoes a decreasing trend,the annual precipitation in Datong was the most in 1950s,it has reduced from 1960s,it has increased in 1990s but not significantly.It has larger change in seasonal precipitation, summer precipitation is decreasing, autumn precipitation was increased,winter precipitation was the largest increase or decrease. the biggest increase in average precipitation in winter after 1980s. Nearly 55 years, heavy rain (snow), rain (snow) tended to decrease the total number of days, including heavy rain, torrential rain days significantly reduced, while the relative increase in the number of snow days. Short-term decreasing trend of heavy precipitation, maximum precipitation in the 1st was a decline trend. Key words: precipitation; trend; Datong; Shanxi