By means of the outputs of 13 GCM models provided by the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCCAR4), the situations of climate change in Chongqing in the next 100 years under different greenhouse gas emission scenarios (SRES A2, SRES A1B and SRES B1) are analyzed. The results show that the climate in Chongqing would have a warming and wetting tendency in the 21st century; the linear tendency of temperature changes would range from 2.3 to 4.2 ℃ per 100 years; precipitation increase would range from 5.9% to 8.8% per 100 years. The largest range of warming would be in winter, while the largest increase of precipitation would be in spring and the largest decrease of precipitation would be in autumn. Considering the effect of SRES A2, SRES A1B, and SRES B1, temperature in Chongqing would increase by 3.68 ℃, 3.28 ℃ and 2.26 ℃, respectively and precipitation would increase by 5.24%, 5.77%, and 3.43% at the end of the 21st century.