Abstract: Based on the temperature observation data of 17 national meteorological stations in Liangshan from 1990 to 2020 and the aerological observation data from 2000 to 2020, this paper conducts a statistical analysis of the climate characteristics of the high tem­perature weather in Liangzhou and classifies the high temperature weather samples in the past 20 years. The conclusions are as follows: The extreme high temperature of each county is basically inversely proportional to the altitude and the extreme high temperature is greatly affected by the terrain, while the warm effect of the river valley is obvious. The fluctuation of maximum temperature on high temperature day is directly proportional to the occurrence times of high temperature day. Ningnan County with the largest number of high temperature days has an obvious negative correlation with Ganluo County, and Dechang County has an obvious positive correlation with Xichang City. The correlation between Mianning County and Xide County, Xichang City and Puge County, Puge county and Huidong County is also good. Except for Meigu, Yuexi, Muli, Huili, Zhaojue, Butuo and Yanyuan, the proportion of continuous high temperature days in each county is high. The number of high temperature days in 10 consecutive days in 30 years is more than 150 days, but the time period is obviously different. The main hot weather features in Liangshan can be divided into behind the trough and in front of the ridge—ridge-controlled type, continental warm anticyclone type, subtropical-high-affected type (I and II), typhoon+subtropical high circulation type, anticyclone type and other types.