Abstract: Based on the observed data of precipitation,temperature and sunshine time from 1950 to 2003 in Xi'an,the climate change characteristics were analyzed.The results showed that the temperature of Xi'an had an increasing trend,which increased 0.72℃ from 1951 to 1990.Temperature increasing mainly took place after 1985.The precipitation of Xi'an had a decreasing trend with fluctuation.Compared with other 4 cities like Lanzhou,Ulumuqi,Xining and Yinchuan in the Northwest China,the temperature in Xi'an had an increasing trend,while the precipitation and sunshine time had a decreasing trend.The trend of climate change in Xi'an was becoming warmer and drier,while that in Lanzhou,Ulumuqi,Xining and Yinchuan was becoming warmer and wetter.

Key words: Xi'an city, Xi'an city, Temperature, Precipitation, Sunshine time, Climate change