This research was to investigate the individual competition characteristics of Pinus tabulaeformis and Platycladus orientalis forests using 13 variables including RD(Relative breast height diameter),RH(Relative tree height),RCB(Relative crown breadth),RCL(Relative crown long),RCA(Relative crown area),CV(Tree crown volume),TCEL(Tree crown extend limit),TCR(Tree crown ratio),TCOR(Tree crown orbicular ratio),TCPR(Tree crown projection ratio),GSI(Growth space index),GSCI(Growth space competition index),CI(Competition index).According to the results from the variables,the tree species can be classified into two types:strong and weak species.Pinus tabulaeformis belongs to the former,and Platycladus orientalis the latter.Research results of biomass,root system,water use,drought resistance and distribution and structure characteristics also provided support for this classification.