Using the classic plot survey method(survey area is 7 200 m~2),niche breath and niche overlap values of ten dominant species were calculated,with layer as one-dimension resource state and abundance as index,in the Pinus kwangtungensis community in Nanling National Nature Reserve of Guangdong.The result shows that niche breadth is significantly different between situations when the utilization of resource is considered and not considered.The sequence of the dominant species is obviously different under the two situations.Considering the result of important values of the species,niche breadth is more reasonable under the situation when resource utilization is considered.The niche breadth of dominant species is generally large,and the majority of the main tree populations can be interdependent and mutual beneficial.Thus the whole community is in stable state.The niche overlaps between Pinus kwangtungensis and other dominant species are correspondingly low.The reason on the one hand is related to its biological and ecological characteristics on the other hand is related to its low niche breadth when the utilization of resource is not considered.