Abstract:The present study is to investigate influnces on resource availability for “target” Gordonia acuminata seedlings, their growth, morphology, canopy structure and biomass by their different neighbors individuals of Pinus massoniana, Symplocos setchuenensis and Gordonia acuminata seedlings . Attempts, was also made to find out the main factors of the neighbor influence on the growth of the “target” individuals in natural gap of subtropical evergreen broadleaved forest. The results show that the growth and light interception differed significantly among different neighbors: The growth characters of target individuals were poorly correlated with the height、the leaf biomass、total biomass of neighbors and their light interception at 10 cm height above ground in canopy, but were highly correlated with their light interception at 30 cm height above ground. Therefore, the major factor for growth of the target individuals was light availability of the neighbor shading the target individuals. The growth dynamics of target individuals, in terms of tree height, number of leaves ,leaf area, leaf size, canopy structure and biomass, were significantly influenced by different neighbors. The height and growth、 the leaf area、the canopy width and the biomass of the target individuals were larger in G. acuminata+ no neighbor than those in G. acuminata+S. setchuenensis those of which were in turn larger than those in G. acuminata+P. massoniana. In G. acuminata+G. acuminata, those characters were smallest. The intraspecific competition in G. acuminata was greater than the interspecific one.