Soil fauna Communities were investigated in three artificial forests and one secondary forest in three seasons, from 1991 to 1992. The composition of groups,distribution of the number of individuals, diversity index of soil fauna were analysed.Results showed that Acarina and Collembola were the dominant community in the four forests in the year round. The seasonal fluctuation of individuals and communities of soil fauna was:April>August>January, and the individuals of soil dominant fauna increased obviously in April. Individuals and their communities on the surface soils were more than those in deep soils. Soil fauna diversity index in different seasons were compared. H'index in secondary forest was higher than that in artificial forests.