Investigation of flora was performed from March to October of 2008 as Eastern and Western coastal districts located in the same latitude ($36^{\circ}47^{\prime}-37^{\circ}48^{\prime}$), in order to apply this to basic data for effective protection and management of coastal forests also for insurance of biodiversity in coastal forests. As a result of the investigation of floras, both coastal forests recorded product-plants as follows: 98 families, 262 genera, 370 species, 46 varieties, 4 forms, 1 hybrid, 421 taxa in total. The Eastern coastal forests had 85 families, 188 genus, 248 species, 32 varieties, 3 forms, 1 hybrid, 285 taxa in total, whereas Western coastal forest had 96 families, 227 genus, 306 species, 39 varieties, 2 forms, 1 hybrid, 348 taxa in total. Among them, seashore plants accounted for 10.2% of total plants appeared in both coastal, and they are 26 families, 38 genus, 40 species, 3 hybrids and 43 taxa in total. There are special Korea plants in both coastal; 9 families, 9 genus, 8 species, 1 varieties, 1 hybrid, 10 taxa in total. There are rare plants in both coastal; 8 families, 8 genus, 7 species, 1 varieties, 8 taxa in total. Naturalized plants are also existed; 11 families, 24 species, 1 variety, 30 taxa in total.