Study on the region of Goseong-gun, Gangwon-do observed a total of 106 families, 385 genus, 598 species, 6 subspecies, 90 varieties, 6 forms. and 700 taxa, and a total of 1,361 specimen were collected during the study. The study was conducted primarily on mountainous areas (Unbongsan (Mt.), Masanbong (Mt.), Noinsan (Mt.), reservoir, lagoon and lake areas (Dowon Reservoir, lagoon Songjiho, lagoon Hwajinpo, lake Cheonjinho). A total of 21 rare plant taxa, including the Gastrodia elata Blume, Nymphaea tetragona var. minima (Nakai) W.T.Lee, Utricularia vulgaris var. japonica (Makino) Tamura and the Epimedium koreanum Nakai, and 7 taxa of endemic plants, including the Clematis brachyura Maxim., Clematis fusca var. coreana (H.L$'{e}$v. & Vaniot) Nakai and the Vicia chosenensis Ohwi, were observed in the study. In terms of the specially designated plants by the Ministry of Environment, 41 taxa of Class-III to higher, including the Menyanthes trifoliata L., Linaria japonica Miq., Iris setosa Pall. ex Link and the Carex arenicola F.Schmidt, were found, and in terms of naturalized plants, there were 66 taxa, including the Diodia teres var. hirsutior Fernald & Griseb., Cakile edentula Hook., Xanthium italicum Moore and the Tagetes minuta L., marking 9.5% of the total number of taxa observed in the study. On an additional note, the additional habitat of the Lycopus uniflorus Michx. was confirmed.