This study is carried out to survey and analyse the vascular plants distributed around the Jusan Reservoir, Juwangsan national park. The results are as follows. The numbers of vascular plants were 377 taxa; 85 families, 253 genera, 332 species, 3 subspecies, 37 varieties and 5 forma. The endangered plants designated by Ministry of Environment were 2 taxa; Berchemia berchemiaefolia (Makino) Koidz. and Iris odaesanensis Y.N.Lee. The rare plants designated by Korea Forest Service were 6 taxa; Eranthis stellata Maxim., Aristolochia contorta Bunge, Aristolochia manshuriensis Kom., Berchemia berchemiaefolia (Makino) Koidz., Scopolia japonica Maxim. and Iris odaesanensis Y.N.Lee. The endemic plants were 4 taxa; Carpinus laxiflora (Siebold & Zucc.) Blume, Pseudostellaria coreana (Nakai) Ohwi, Philadelphus schrenkii Rupr. and Weigela subsessilis (Nakai) L.H.Bailey. The specific plants by floristic region were 38 taxa; Juglans mandshurica Maxim., Salix chaenomeloides Kimura, Hylomecon vernalis Maxim., Lonicera praeflorens Batalin, Erythronium japonicum (Baker) Decne., Potentilla dickinsii Franch. & Sav., Celtis aurantiaca Nakai, Anemone reflexa Steph. & Willd., Cimicifuga heracleifolia Kom. and so forth. The naturalized plants were 20 taxa; Fallopia dumetorum (L.) Holub, Chenopoidum album L., Lepidium apetalum Willd., Veronica persica Poir., Conyza canadensis (L.) Cronquist, Taraxacum officinale Weber and so forth.