Abstract: The arbor stratum of Quercus aliena var. acuteserrata stands included two substratums. Phanerophyta synusium was in first position,and hemicryptophyta was inferior to it. The DBH structures of Quercus aliena var. acuteserrata and Pinus armandii were sinister normal school,which could finish self regeneration under the natural conditions. The small DBHclass individuals of Pinus tabulaeformis were dominant,their DBHclasses being distributed irregularly and absent very much. The large DBH classes of Toxicodendron vernicifluum took biggish proportion,belonging to declining population. Young trees were the principal individuals of Castanea mollissima ,and in transitional age stage from the young to the middle. Populus davidiana was in the transitional stage from progressive to stable and young middle age stands. The stands DBHstructure was mainly influenced by the DBHvariety of Quercus aliena var. acuteserrata population.Quantitative classification (ward's method ward) and ordination (PCA) were used to study the community types of sharp tooth oak. The results showed that the community could be divided into 6 types:①Ass. Smilax stans + Rosa multiflora Quercus variabilis + Ulmus glaucescens Quercus aliena var. acuteserrata ; ②Ass. Smilax stans + Lespedeza bicolor Castanea mollissima Q. aliena var. acuteserrata ; ③Ass. Corylus mandshurica Populus davidiana +Dendrobenthamia angustata Q. aliena var. acuteserrata ; ④Ass. Prunus pseudoccrasus + Corylus mandshurica Toxicodendron vernicifluum Q. aliena var. acuteserrata ; ⑤Ass. Corylus mandshurica + Rosa multiflora Pinus armandii Q. aliena var. acuteserrata ; and ⑥Ass. Sinarundinaria nitida Pinus armandii + Pinus tabulaeformis Q. aliena var. acuteserrata .Ward's method ward was better for classifying community types than the other clustering analyses in Qinling Mountains. The PCAresults were consistent with the clustering,and demonstrated that the sharp tooth oak stands were influenced by the altitude,site gradient and soil mainly.