This study is a survey of the flora distributed in Seocheon tidal flat wetland protected area of nearby island (Daejuk-do, Tokki-deung, Muk-do) and Yubo-do Seocheon-gun Chuncheongnam-do, Korea. The numbers of vascular plants were summarized as 231 taxa including 65 families, 167 genera, 204 species, 2 subspecies, 23 varieties and 2 forms. The halophytes were 33 taxa including 15 families, 29 genera, 29 species, 3 varieties and 1 form (Chenopodium album var. stenophyllum, Cnidium japonicum, Juncus haenkei and so on). The rare plants were 4 taxa including Pseudoraphis ukishiba (VU), Belamcanda chinensis (VU), Phacelurus latifolius (LC) and Polygonum bellardii (DD). The Korean endemic plants were 2 taxa including Salix pseudolasiogyne and Forsythia koreana. In the specific plants by floristic region were 24 taxa, a degree Ⅰ were 19 taxa (Rhodotypos scandens, Zanthoxylum planispinum, Cynodon dactylon and so on), 2 taxa of a degree Ⅲ (Elymus mollis and Asparagus oligoclonos), 3 taxa of a degree Ⅳ (Polygonum bellardii, Wisteria floribunda and Pseudoraphis ukishiba) and degree Ⅱ, Ⅴ were not found. The naturalized plants were 40 taxa including Phytolacca americana, Sicyos angulatus, Lactuca scariola and so on. Naturalization rate (NR)