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The aim of this study is to advocate a change detection method for coseismic landsliding using RGB color composite image assigned pre-earthquake DEM (SRTM-3) and post-earthquake DEM (ALOS/PALSAR InSAR DEM). In this study, we applied our proposed method to landslide areas occurred by the Iwate-Miyagi Nairiku Earthquake in 2008. As a result, we found out that the area of sliding length and sliding width over 200m where is detected in the RGB color composite image using SRTM-3 and ALOS/PALSAR InSAR DEM. In conclusion, we showed that it is effective in using PALSAR data to analyze topographical changes in mountainous area.