This study was carried out to offer the raw data for environment conservation by surveying and analysing the vascular plants of Gotjawal terrain which is covered by aa rubble flow in Jeju island. The period of survey was from February 2007 to February 2008 at the site of four Gotjawal terrains. The vascular plants in Gotjawal were consisted of total 616 taxa including 111 taxa of ferns; 124 families, 401 genera, 514 species, 3 subspecies, 55 varieties, and 9 forms. Among the investigated plants, the special plant species based on floral region by Ministry of Environment were 202 taxa including 19 taxa in grade category. Law-protected plants by the Ministry of Environment were 6 taxa such as Quercus gilva, Mankyuya chejuense, Cymbidium nipponicum, and Galeola septentrionalis etc. Also, Korean endemic plants of this area were 8 taxa such as Mankyuya chejuense, Cardamine violifolia, Rubus hongnoensis, and Ligularia taquetii etc.