The flora of the Wi-do (Island) were listed 146 taxa; 61 families, 117 genera, 119 species, 21 varieties and 6 forms. Divided into 146 taxa; woody plants were 73 taxa (50.0%) and like to herbaceous plants were 73 taxa (50.0%). Based on the list of rare plants by Korea Forest Service, existed of the Wi-do (Island); Penthorum chinense (Preservation priority order: No. 144) and based on the list of Korean endemic plants, 4 taxa existed; Carpinus turczainovii for. coreana, Lespedeza maximowiczii for. tomentella, Indigofera koreana and Euonymus quelpaertensis. Based on the list of specific plant species by floral region were total 29 taxa (19.9% of all 146 taxa of flora); Raphiolepis umbellata in class III, Caryopteris incana in class II, 27 taxa (Asparagus cochinchinensis, Quercus acuta, Machilus thunbergii, Pittosporum tobira, Euscaphis japonica, Elaeagnus glabra, Ardisia japonica, Aster spathulifolius, etc.) in class I. The naturalized plants in this site were listed 5 taxa (Chenopodium ficifloium, Phytolacca americana, Robinia pseudoacacia, Erigeron annuus, Erechtites hieracifolia) and naturalization rate was 3.4% of all 146 taxa vascular plants. The plants community in the Wi-do (Island) were classified into 7 communities; Carpinus turczainovii for. coreana community, Castanopsis cuspidata var. sieboldii community, Quercus acuta community, Machilus thunbergii community, Quercus serrata community, Salix nipponica community and Pinus thunbergii community.