A Study on the degree of green naturality(DGN) and vegetation analysis was conducted in the vicinity of Samcheonpo steam power plant during the period of August to October, 1982. Six different grades of DGN; 1, 2, 3, 5, 6, 7 have been registered and the average DGN of 4.32 for the survey area. Prominant DGNs were 2 and 6, which occupied about 80% of the survey area. The most dominant species was Pinus thunbergii and dominamt species groups were constituted with Rhododendron mucronulatum, Tracheospermum asiaticum and Quercus serrata in the tree layer. In the herb layer, Graminean species(Arundinella hirta, Melica onoei, Miscanthus sinensis, Andropogon brevifolius) were abundant. Five different species diversity indices were caculated from the data of vegetation analysis. The growth state of Pinus thunbergii was very favorable.