Abstract: Choosed the daily average temperature and daily relative humidity data of 14 counties in 1980-2016 years in Chengdu area,based on Temperature Humidity Index (THI),this paper tries to analyze and evaluate Climate comfort degree in Chengdu,the results show that:April and October are very comfortable months,no extreme uncomfortable months,spring and autumn are very comfortable seasons,summer is uncomfortable season,winter is relatively uncomfortable season,the climate comfort has improved in the past 37 years.In comparison,the climate comfort of northwest,central of Chengdu and Pujiang county is better.The abrupt change of climate comfort mostly occurred in the period of 2009-2013.The abrupt change of winter occurred in 1984.In winter,the climate comfort tends to improve obviously.