Abstract: Based on the meteorological observation data of the Shapingba (urban) and Beibei (suburban) sites in Chongqing City during the summer of 1959-2018 (June-August), explore the characteristics of the 60-year high temperature event in the urban area of Chongqing City, analyze the differences between the suburbs and the changes in the number of warm night days Features, and calculate the temperature-humidity index (THI) to explore the impact of humidity factors on human discomfort. The results show that: (1) The high temperature heat wave in the urban area of Chongqing showed a decreasing trend in the 1960s and 1980s, began to increase in the 1990s, and increased sharply after the 21st century. It reached its peak in the summer of 2006, with 23 days of heat wave. Based on the analysis of the difference between the two stations on the outskirts of the city, after 1997, the urbanization process has led to an increase in the daily average temperature and daily minimum temperature in the suburbs, indicating that the city has a significant effect of increasing temperature at night. The difference in relative humidity increases, and the humidity in urban areas decreases significantly. (2) The incidence of warm nights was significantly greater than that of daytime high temperature heat waves, and they existed stably. The highest number of warm nights occurred in 2013, reaching 33 days. During 2000-2009, the proportion of days with high temperature both during the day and night reached 35.73%, and increased to 55.89% in 2010-2018. The process of urbanization has a certain impact on the high temperature at night in the urban area of Chongqing. (3) In recent years, the number of days of high temperature and humidity in Chongqing has gradually increased. Humidity has a non-negligible effect on human comfort. Among all data with THI> 24, the proportion of days with relative humidity greater than 70% accounted for 22.51%; nighttime discomfort is greatly affected by humidity factors, and the proportion of days with relative humidity greater than 70% is 64.12%. Continued the hazards of daytime high temperature.