This paper aims to clarify the landscape characteristic and propose the utilization method based on the 90 landscape paintings of the coastal area of Seto Inland Sea. By analyzing the landscape elements depicted in landscape painting and the viewpoint in which the painting painted, the landscape characteristics were clarified. Through PCoA analysis and cluster analysis, 90 landscape paintings were classified into six landscape groups and the significant characteristics of each group were summarized into the landscape index of this area. From a case study, we proposed a utilization method of landscape index in urban planning on viewpoint exploration.