Earth temperature was studied respectively, in Fb-Orthic Histosols area and Mat-Cryic Cambisols soil area at the same elevation and near in distance. The result showed that the two types of soils were under the identical climate, yet the earth temperature distribution differed significantly. According to the character of the earth temperature distribution in 40-80cm soil layer of the two soils, the soil temperature in Mat Cryic Cambisols varied dramatically averaging annually 3.4℃,with its zero temperature isoline extending fairly deep, whereas it was quite steady in Rb-0rthic Histosols, averaging annually 1.4℃ with its zero temperature isoline only reaching at 80-90cm or so. With increasing soil depth, the difference in variation of earth temperature in two types of soils became greater.