This study is on surface sedimentary facies and environment changes of open-coast beach, appeared before and after the typhoon Kompasu in 2010. The study area was the macro-tide Myeongsasipri beach of Gochanggun, located in the southwestern coast of Korea. The typhoon Kompasu moved along the southwestern coasts and across midlands of the Korean Peninsula from 1 to 2 September in 2010. Coastal effects of the moving typhoon were investigated in terms of the surface variations of surface sediment facies and sedimentary environment. Surface topography and sediments before and after the typhoon (August - September 2010) were measured and sampled along the Myeongsasipri survey line of 22 sites, respectively. The surface sediments of the Myeongsasipri beach were mainly composed of fine and medium sand sediments. Spatial distribution pattern of sedimentary facies before the typhoon showed a trend of coast-parallel bands of fine sand facies and medium sand facies, whereas that after the typhoon represented a simple distribution of fine sand facies, not showing the coast-parallel bands.