Abstract:Relatedness of importance values of dominant populations to the ecologicalfactors in secondary succession of forest communities in Heishiding NatureReserve, Guangdong Province, was analyzed by using relatedness degree of the gray systemtheory. The results showed that pioneer species, Pinus massoniana, Cunninghamia lanceolataand Schima superba, were mainly affected by transmittance in the communities. Otherheliophytes such as Schefflera octophylla, Meliosma fordii, Diospyros morrisiana and Symplocos adenophylla were less affected by the environmental factors The mesophytes， Artocarpus styracifolius，Lithocarpus fohangwa Machilus breviflora，Lindera chunii and Cryptocarya concinna，were mainly afected by the richness of species and density of the communities， while mesophytes such as lxonanthes chinensis and Altingia chinensis were mainly affected by transmittance in the communities．The influences of the environmenta1 factors or fifteen dominant populations in descending order were transmittance in communities，richness of species，density of communities and conditions of soil. Comprehensive influence of all environmental factors appeared greatly on the mesophytes as compared to other species．