To provide basic background information for weather service in the South China Sea, the temporal and spatial distribution characteristics of sea fog in the South China Sea from January to March is studied using sea fog retrieval products of 2011-2016 from FY-3B. The results show that sea fog has specific spatial distributions in the South China Sea. Sea fog tends to present in inshore areas of Southern China, the Beibu Gulf, Qiongzhou Strait and the northeastern coast of Hainan Island, while south of the South China Sea see less sea fog. In the South China Sea, the highest frequency of sea fog occurs in February, while the lowest in March. This study is expected to provide background information for further sea fog researches over the South China Sea.