Foramiminfera in sediment at north and west of Rad Island, Samaesan Island were studied in March, summer season, and July, rainy season, 2012. There are 7 foramininfera groups found with Quinqueloculina as dominant group at north site, and Globigerina at west site. In summer season Globigerina was found distance from coastal area but at west side was found at coastal area more than distance away. Water quality was not different in both season but north site nitrate and silicate slightly higher than west site. In west site ammonia phosphate and alkalinity were slightly higher. In summer season organic matter in sediment was higher at north site but carbonate content was not different from together. In rainy season organic matter and carbonate content were higher at west than north site.