To reveal the complex relationships between the characteristics of interspecific association and community succession in the succession process of pine oak forest community on the south-facing slopes in Qinling Mountain.Based on 2×2 contingency tables,we used the variance ratio,χ² test,Jaccard index and Spearman’s rank correlation coefficient to study the characteristics of interspecific association and correlation among main plant populations of different successional stages in the successive serials from Pinus tabulaeformis forest to P.tabulaeformis-Q.aliena var.acuteserrata mixed forest then to the subsequent Q.aliena var.acuteserrata forest on the south-facing slopes in Qinling Mountain.The results showed that:(1)the overall interspecific associations of dominant species in P.tabulaeformis forest,Q.aliena var.acuteserrata forest and P.tabulaeformis-Q.aliena var.acuteserrata mixed forest are significant positive connection,each community has a relative stability.(2) The positive and negative interspecific associations and correlation percent of main species in P.tabulaeformis forest and P.tabulaeformis-Q.aliena var.acuteserrata mixed forest are smaller,and their community stability are inferior to Q.aliena var.acuteserrata forest.(3)Interspecific competitions among pioneer species,pioneer species and prior transitionary species,climax species,post transitionary species and climax species are more intense,but there are more positive connection among the transitional species(including prior transitionary species,prior transitionary species and post transitionary species,post transitionary species) ,and the interspecific relationship is more stable relatively.(4)The main species in different succession process of pine oak forests community are respectively divided into 4,5,4 ecological groups.Above all,the interspecific relationship of main species in the succession process of pine oak forest community on the south-facing slopes in Qinling Mountains gradually become stable and concomitant.In practice,the reasonable adjustment measures of interspecific relationship can prompt the pine oak forest community on the south-facing slopes in Qinling Mountains more stable and healthier,effectively shorten the process of succession.