Global climate warming has been confirmed, and region climate change would impact on the physiological activities of plants, and then have an influence on the structure and functions of vegetation. Tropical forests in Jianfengling, Hainan Island is one of the typical tropical forest ecosystems. Its long term climatic dynamics is important to assess the response and adaption of forest to global change. Long-term data (1957─2005) of air temperature and soil surface temperature in Jianfengling tropical forest area were used to analyze the inter-annual trends of heat condition and discuss the influences on the tropical plants. The results showed that, annual mean air/ground temperature during past 50 years was 24.7and 29.0 ℃. Annual mean air/ground temperature, annual mean maximum and minimum air/ground temperature, annual extreme maximum and minimum air/ground temperature, and annual accumulated temperature have been rising in the past 50 years over the Jianfengling forest. Annual mean air, annual mean maximum/minimum air temperature, extreme maximum/minimum air temperature and extreme maximum ground temperature increased significantly, having a increase of 0.17, 0.29, 0.35, 0.30, 0.53, 1.93 ℃ per 10 year.These facts indicate that the change of the minimum temperature is more sensitive than that of the maximum temperature. Monthly mean air temperature in January, February, August, October and November increased significantly, having a increase of 0.27, 0.28, 0.14, 0.12, 0.24 ℃ per 10 year. Monthly mean ground temperature in January, February and March increased significantly, having a increase of 0.47, 0.82, 4.56 ℃ per 10 year. It is concluded that the main contributor of climate warming in Jianfengling tropical rainforest is the rising of the minimum air temperature and maximum ground temperature. The rising temperature in dry seasons made a greater contribution to the increase of air temperature and ground temperature. As Jianfengling is located in the north verge of tropical region, its rising temperature will benefit the tropical plants living there.