Abstract: The primary community at Kongqing mountain was evergreen forest mixed with deciduous broad-leaved trees. Because of human disturbance, the secondary deciduous broad-leaved forest is dominant.The secondary forests at Kongqing mountain could be divided into two types, deciduous broad-leaved forest and deciduous broad-leaved forest mixed with evergreen broad-leaved trees,six formations,which are Quercus variabilis、Q.acutissima、Q.fabri、Pistasia chinensis、Q.variabilis-Ilex purpurea、Q.fabri-Ilex purpurea forests respectively. Species richness,evenness and species diversity index of forest communities were discussed.They are relative to site conditions、crown density and human disturbances.Generally,species diversity is higher,if the site of stands is better.The species diversity of the stands of secondary succession stage is higher than climax community. The human disturbances or lower crown density may be the causes of increasing diversity.Species diversity index for different stratum was in the following order:shrub stratum>herb stratum>tree stratum.