Abstract: The soil temperature observation in different density of peach tea ecosystem and pure tea ecosystem have been made in the summer of 1993 in Linan City,Zhejiang Province. The result indicates that when the depth of the soil increases in the peach tea ecosystem and pure tea ecosystem,the amplitude of temperature decreases in accordance with geometric series and the phase of temperature trailed in accordance with isogap series. The temperature gradiene variation of soil are similar as the variety character of soil temperature. According to the soil temperature variance with the depth of soil,four types of the vertical distribution of soil temperature were divided,namely:(1)solar type,(2)radiation type,(3)transitional type in early morning,(4)transitional type in evening. Compared with the pure tea ecosystem the daily amplitude of earth′s surface temperature at 0 cm,that the tea ecosystem decreases 18.2℃ in the clear day and 9.7℃ in the cloudy day. Above changes are favourable for increasing fruit trees and tea plants.