This study was carried out to classify forest vegetation structure of Mt. Jiryeong from July to August in 2009 using phytosociological analysis methodology of Z-M schools. Forty-nine study sites(quadrat) were surveyed in the area. Accordingly, the Actual vegetation of the investigated areas were classified into 1 community group, 5 communities and 4 groups, and the vegetation unit was classified into total of 7 units.
I. Pinus thunbergii community group
A. Quercus serrata community
1. Quercus dentata group
2. Pinus densiflora group
B. Quercus mongolica community
1. Orixa japonica group
2. Styrax japonica group
C. Koelreuteria paniculata community
D. Mallotus japonicus community
E. Vitex rotundifolia community
Phytosociological vegetation was classified into 18 communitied such as Pinus thunbergii community, Pinus densiflora community, Vitex rotundifolia community, Elymus sibiricus community, Koelreuteria paniculata community, Quercus mongolica community, Orixa japonica community, Rosa rugosa community, Scutellaria strigillosa community, Calystegia soldanella community, Lathyrus japonica community, Platycarya strobilacea community, Ischaemum crassipes community, Mallotus japonicus community, Pinus koraiensis community, Carex kobomugi community, Celtis sinensis community, Tilia amurensis community.