Abstract: In 2010,the annual mean temperature in datong was higher 0.2~C than normal;spring mean temperature was the second lowest since 1971,while summer temperature was the second highest since 1971.Annual preeipitation in datong was 418.9mm, 5% more than normal;precipitation in autumn was the second most since 1971.During this year, extreme weather and climate events happened freqnently,a number of meteorological items broke historical records.ln winter and spring, unusual continuous low temperature delayed spring sowing and growth of crops;In summer , the maximum temperature broke historical records,the periodic drought was obvious,the flood disasters and hail hazards were more; In autumn,the rainy weather caused waterlogging and crops regreening;In spring ,the gale and dust weather affected most of datong.These all brought more losses both to the social economy and to people life,in which,drought ,hail and flooding hazards caused more serious losses.