Abstract: The paper mainly used the meteorological data of Xianyang,Shaanxi province,from 1960 to 2009 and methods of statistical analysis,such as Thornthwaite Memoriai climatic productivity model and Kriging interpolation method,to analyze the space and time change characteristics of temperature,precipitation and the climatic productivity of the last 50 years and the driving factors that affect the yields of crops.The results indicated that(1) the warming-drying climate tendency was very obvious of Xianyang in the last 50 years,the sudden warming occurred in 1994,and the sudden decrease in precipitation occurred in 1984;the climatic productivity decreased by-70.4kg·ha-1·10y-1 and in 1984 it decreased in a sudden.(2)The annual mean temperature of the north area of Xianyang was lower than that of the south area;the coefficient of variation of the north area was higher than the south one;the climate inclination rate was the warming tendency of the northeast and it was stronger than that of the other areas.The annual mean precipitation of the north area was larger than that of the south area;but the coefficient of variation of the north area was less than that of the south area;the climate inclination rate which was the decrease trends of the northwest was more than that of the southeast.The climatic productivity and its coefficient of variation were increasing gradually from north to south;the climate inclination rate significantly decreased except Xunyi county area.(3)The warm-wet climatic environment was the most advantageous to the agricultural production of Xianyang,the increase in production was 5.89%～11.44%;the cold-dry climatic environment was the most disadvantageous to agricultural production,the production decrease scope was 6.3%～13.11%,the potential crop production increase of the mid-west area was the biggest,the potential production increase was 49%～62%,the warming-drying tendency of climate was disadvantageous to agricultural production.

Key words: Xianyang, Xianyang, Climate change, Climate productivity