To explore the spatio-temporal variation characteristics of 0 cm ground temperature in Guizhou Province over the past 40 years , based on the daily average 0 cm ground temperature data of 81 national meteorological stations in Guizhou from 1984 to 2023 , this article analyzes the spatio-temporal variation characteristics of 0 cm ground temperature in Guizhou province in the past 40 years by using regression analysis , Mann-Kendall non-parametric statistical test and Pettitt test. The results show that : ( 1 ) The average ground temperature in Guizhou has an overall upward trend in both the whole year and four seasons , and it is especially significant in the whole year , spring , summer and autumn ( P < 0 . 01 ) . The spatial distribution of ground temperature is " high in the south and low in the north , high in the east and low in the west " . The high-value areas of ground temperature in summer are mainly located in the eastern and southern edge areas of Guizhou Province , while such areas in the whole year , spring , autumn and winter are mainly in the southern edge areas of Guizhou Province . (2) The average ground temperature in Guizhou Province has shown a sudden rise in both the whole year and four seasons , in which the abrupt changes of the ground temperature in the whole year , spring and summer were concentrated in the early 2000s , and the autumn ground temperature experienced a sudden change in 1997 . After the abrupt change , the warming amplitude became more significant. The warming amplitude before and after the abrupt change was in the order of spring > autumn > summer > the whole year > winter. (3 ) The trends of ground temperature inclination rate show a pattern of spring (0 . 54 ℃ · decade - 1 ) > Autumn (0 . 41 ℃ · decade - 1 ) > summer (0 . 27 ℃ · decade - 1 ) > winter (0 . 23 ℃ · decade - 1 ) , with a spatial distribution characterized by " high in the west and low in the east " . More than 90% of the stations have a ground temperature inclination rate greater than 0 throughout the whole year and four seasons . Moreover , except in summer and winter , more than 85% of the stations have passed the significance test of P < 0 . 05 . Finally , under the background of global warming , the annual and seasonal mean ground temperatures show a consistent and significant upward trend in Guizhou Province , and they all have experienced abrupt upward changes .