Abstract: Based on the observed data from 1961 to 2000 in Jinzhong City,Shanxi Province,the temperature and precipitation were analyzed by using regression and correlation methods.The results showed that the annual mean temperature appeared to be increasing in the last 40 years.The trend of temperature increase was obviously in the late of 1990's.The rate of temperature increase was different in the different seasons,but warming up in winter was significant.The temperature increase in the spring made the beginning day of ≥10℃ earlier.The precipitation appeared to be decreasing.The precipitation obviously decreased during the key water-required periods of Maize in the plain areas,but increased in the mountain areas.These changes made impacts on Maize production more complicated.

Key words: Climate change, Climate change, Maize, Impact analysis