Foraminifera in sediment at Kham Islands, Samaesan Island were studied in March, summer season, and June, rainy season, 2013. There are 13 groups found with total density 186,945-337,697 cells/square meter. Total density in March higher than June and north side than southward. Ammonia sp. As dominant group and the less were Quenqeloculina sp., Cornuspiridae and Elaphidium sp., respectively. 12 groups found at Kham noi island, Sichang Islet, the total group found at east site higer than west but low total density. Total density in Mach higher than June, Total density were 207,728-428,571 cells/square meter. Dominant group was Spiroloculino sp. and Valvulinidae. Biodiversity index in March at Kham Island higher than Kham Noi Island but not different both site in June. Organic matter and Calcium Carbonate content in sediment at Kham Island a little bit higher than Kham Noi Island. Total group, total density, biodiversity index and dominant species at Kham Island higher than Kham Noi Island in 2013.