In order to understand the flora of Mt. Byungdoo, survey of vascular plants was conducted in 2010. It found that flora of Mt. Byoungdoo was consisted of 295 taxa, i.e., 218 species, four subspecies, 60 varieties, and 13 formae. Among them, Korean endemic species was 18 taxa. Also, the conservatory plants classified from fifth to first grade by Ministry of Environment were distributed 60 taxa in the Mt. Byungdoo. It is shown that this site is very high biodiversity in spite of small area relatively. The naturalized plants were found eighteen taxa. Eleutherococcus senticosus and Lilium cernuum, rare and endangered species, were confirmed from this survey. Therefore, it needs the conservation strategy for rare and endangered species.