Abstract:By analysing the relatedness degree adopted in the grey system theory, priliminary study on the relatedness of the growth of the dominant populations′, distribution and notability vs. the ecological factors in the secondary sere of the evergreen broadleaved forest communities in Mt. Jinyun of Sichuan was reported,in this paper. After the adoption of the basic idea that the spatial difference can substitute for the time change, each tree in the contiguous grid quadrats is measured. The result reveals the relationship between the growth of eight dominant populations, distribution and notability of the secondary sere of forest communities in Mt. Jinyun and the nine ecological factors. The analysis of the values of relational grades expresses that the pioneer species, i.e. Pinus massoniana, is controlled by much weak environmental conditions, and the climax species, namely, Gordonia acuminata, Castanopsis fargesii, Castanopsis carlesii var. spinulosa, etc., are mainly controlled by the conditions of the soil, such as organic matter, thickness, moisture and pH. The sequence of the latent effect of the nine environmental factors on the eight dominant populations from the strongest to the weakest is organic matter content of soil>thickness of soil>richness of species > pH of soil >moisture content of soil>interference>elevation>slope gradient>transparence of community. And the order of the eight dominant populations synthetically influenced by the nine ecological factors from the strongest to the weakest is probably Castanopsis fargesii>Schima argentea>Gordonia acuminata> Castanopsis carlesii var. spinulosa> Pinus massoniana>Neolitsea aurata var. glauca > Symplocos setchuanensis > Symplocos lancifolia.