Based on the monthly data of ground temperature at a depth of 0 cm as well as other meteorological elements of 17 meteorological observation stations from 1980 to 2018 in Hainan Island, the changes in ground temperature and their relationship with meteorological elements are analyzed by the mathematical statistic method. The results show that the annual ground temperature of Hainan Island showed an increasing trend, and the ground temperature rising in autumn had the greatest contribution, and that in spring was the second. The MK test confirms that the annual and spring, autumn ground temperature had significantly increasing trends with the significant mutation around the midtolate 1990s. The annual ground temperature was low in the central and high in the south parts. In most regions, ground temperature had increasing trends. Among the relationships with ground temperature, the air temperature had a significant positive drive to ground temperature. The decrease of sunshine duration and the increase of precipitation caused slow ground temperature warming trends. The effect of wind speed on ground temperature was more complicated, and different in different seasons.