Based on the systematic Observational data,this paper deals with the dynamic changes of soil temperature under evergreen forest, upland of hills and rice production region on the plain of the Pearl River Delta; and discusses the effects of atmosphere temperature on the changes of the soil. Results showed that the difference in three dimension of temperature under ever-green forest region was larger than that in hills and plain region. It was found that the atmosphere temperature of the valley part of the south subtropical forest region was higher than that under coniferous, mixed or broad-leave forest;the surface temperature of the valley part is lower than that under coniferous forest but higher than that under mixed or broad-leave forest; the temperature of 20cm depth of soil layer of valley part was lower than that under coniferous and broad-leave forests but higher than that under broad-leave one. In the hills region with the same atmosphere temperature,there was still a slight difference in temperature of surface and soil layer due to differences in cultivated plants; while on the plain region almost no difference in annual atmosphere temperature, surface temperature and temperature in 20cm depth of soil layer was found. It indicated that there was clear difference in the temperature of atmosphere, soil surface and soil layer and its dynamic changes under different geomorphologic regions. Based on the research results, it is suggested that a year can be divided into two seasons, namely hot season with averege temperature >22℃ and cold season with average temperature <22℃; effective measures should be taken to regulate the soil temperature in order to satisfy the needs of normal growth of plants.