Mt. Palgong is situated in the southeastern Korea, on 35°57`-36°04`N and 128°31`-128°48`E. The highest elevation is 1192.3m and the lowest is about 300m. Climatically, it belongs to the southern temperate zone of five zones of korean forest land, divided by mean annual temperature. Most part of this area is covered with secondary forests. The forest vegetation of this area were studied phytosociologically by the method of Zu¨richMontpellier school and the results obtained were as follows 1. The forest vegetation of this area were classified as given below. 1) Pinus derzsiflora forest I. Pious derzsiflora-Quercus mongolica eommunity(Mountain forest) I-A. Carpinus laziflora group I-A-1. Melampyrum roseum-Oplismenus undulatifolius subgroup I-A-2. Quercus aliena-Platycarya strobilacea subgroup I-A-3. Sorbus alnifolia-Melampyrum roseum subgroup I-A-4. Sorbus alnzfolia subgroup I-A-5. Sorbus alnifolia-Carex ciluato-marginata subgroup I-A-6. Carpinus cordata-Corylus sieboldiana subgroup I-B. Typical group I-C. Symplocos chinensis for. pilosa group I-D. Juniperus rigida group I-D-1. Melampyrum roseum subgroup I-D-2. Typical subgroup II. Pious densiflora-Climbing plants community (Valley forest) II-A. Oplismenus undulatifolizis group II-A-1. Carex siderosticta subgroup II-A-2. Typical subgroup II-B. Typical group 2) Mixed forest I. Pinazs densiflora-Querezrs mongolica community (Mountain forest) I-A. Carpinus laxiflora group I-A-1. Sorbus alnifolia subgroup I-A-2. juniperus rigida subgroup I-A-3. Typical subgroup I-B. Typical group I-C. Miscanthus sinensis var, purburascens group I-C-1. Juniperus rigida subgroup I-C-2. Typical subgroup II. Pinzrs denszflora-Oplisnzenus urzdulatfolizcs community(Valley forest) II-A. Carpinus laxiflorcz-Acer rrzono group II-B. Lindera erythrocarpa group 3) Deciduous broad-leaved forest I. Quercus mongolica communitylMountain forest at upper elevations; I-A. Quercus mongolica-Synaplocos chinensis for. pilosa group I-A-1. Synaplocos chinensis for. pilosa -Care spp. subgroup I-A-2. Typical subgroup I-B. Quercus mongolfca-Rhododendron mucronulatum group I-B-1. Sorbus comrnixta- Vaccinium koreanum subgroup I-B-2. Typical subgroup I-C. Quercus mongolica-Sara borealis group I-D. Quercus mongolica-Rhododendron schlippenbachii group I-E. Typical group II. Betula schnzidtii communitylMountain forest at lower elevations) III. Carpinus laxiflora community (at middle elevations) IV. Acer mono community (Valley forest at middle elevations) IV-A. Carpinus laxiflora-Acer marzdshuricum group IV-B. Typical group V. Alnus hirsuta var, sibirica-Carpiraus cordata community (Valley forest at upper elevations) VI. Alrazrs hirsuta community (Valley forest at lower elevations) VII. Cornus controversy community (Valley forest at middle elevations) VIII. Ainzrs japonica community (concave and straight area at middle elevations) IX. Aeer mono-Cornus controversy community (Valley forest at lower elevations; X. Zelkova serrata-Liradera erythrocarpa eommuniely (V alley forest at lower elevations) X-A. Carpinus loxiflora group X-B. Typical group 4) Larix leptolepis plantations I. Quercus morzgolica type(at upper elevations) I-A. Corpus controversa-Carpinus cordata group I-B. Typical group II. Stephanandra irzcisa type (at lower elevations) II-A. Corpus controversy-Calamagrostis arum dinacea group II-B. Miscanthzes sinensis var. purpurascens group 2. Judging from the coincidence method, the division of pine and deciduous broad-leaned forest communities was closely- related to altitude and topography and that of mixed forest communities to topography. 3. Species composition of forest communities under stratification were ; a) for pine forest, 15.5% (19. 6%) of trees, 28.4% (36.8%) of subtrees, 34.6% (43.6%) of lower trees and 21.5% of shrubs, b) for mixed forest, 22.5% (29.7%), 27.7% (37.3%), 25.4% (33.0%) and 24.4%, and for deciduous broad-leaned forest,