This study on the southern coastal waters of Korea has been made by analysis of NOAA image and oceanographic observation data from October 1987 to August 1988. The results obtained from the study are as follow: Horizontal distributions of water temperature in different layers in winter ranged from 6.07 to 18.62$^{circ}C$ at 0m layer, 6.02 to 18.54$^{circ}C$ at 30m layer and 7.19 to 18.69$^{circ}C$ at 50m layer. Consequently its vertical distribution showed homogeneity. Horizontal water temperature gradients were 0.28$^{circ}C$/mile between the coastal waters and Tsushima warm waters. In summer, its horizontal distribution varied from 19.37 to 29.92$^{circ}C$ at 0m layer, 13.26 to 27.11$^{circ}C$ at 30m layer and 7.36 to 26.6$0^{circ}C$ at 50m layer, and its vertical profile showed stratified structure. Vertical water temperature gradients were 0.44$^{circ}C$/m between 30 and 50m layers. It was remarkable that distribution of southern coastal water system analysed by NOAA image coincided with relatively the oceanographic observation data but SST from NOAA image seemed to be 2-4$^{circ}C$ lower in winter and 4-6$^{circ}C$ lower in summer than the oceanographic data.