Abstract: Based on the daily meteorological observation data, the hourly meteorological observation data and the total cloud cover grid data of 3DcloudA of 156 national meteorological stations in Sichuan province from 2018 to 2020, the daily and hourly UTCI are calculated. Taking the UTCI between 9℃ and 26 ℃ as the comfort state of outdoor thermal environment, the comfort zoning of Sichuan area is studied on the basis of statistical analysis of the average annual UTCI value, the average annual comfort days, the average monthly comfort days and the average daily comfort hours of each station. The results show that most parts of the Basin are comfortable at night and in spring and autumn. In southern Aba, western Ganzi and northern Liangshan, daytime and summer are comfortable. The southern part of Panxi area generally presents the characteristics of all-day and winter comfort. The northern part of Ganzi, the central part and the northern part of Aba are characterized by human discomfort.