对南海表层沉积物中正构烷烃和多环芳烃的含量与分布进行了调查研究。发现南海表层沉积物的正构烷烃碳数分布范围多在C_16－C_33，奇偶优势指数OEP值略大于1，显示有机质输入有混合源的特征；共检出近60种多环芳烃化合物，包括萘、菲、蒽、芴、萤蒽、芘、系列化合物和惹烯、等陆源输入标志物。在此基础上，将所获得的数据进行了因子分析，其结果显示南海表层沉积物的物质输入有如下的特点：陆源高等植物输入和燃烧产物的贡献从北向南递减，而海源输入的特征是由北向南显著。 The content and distribution of n-alkanes and polycyclic aromatic hydrocarbons in the surface sediments of the South China Sea were investigated. It was found that the C16-C_33 distribution of nalkanes in the surface sediments of the South China Sea was more than that of C_16C_33, while the Odd / Even Odds Index (OEP) was slightly larger than 1, indicating that there were mixed sources of organic matter. Nearly 60 PAHs including naphthalene , Phenanthrene, anthracene, fluorene, fluoranthene, pyrene, series of compounds and provoke, and other terrestrial input markers. On this basis, the data obtained were analyzed by factor analysis. The results showed that the surface sediments in the South China Sea had the following characteristics: the contribution of land-derived higher plant inputs and combustion products decreased from north to south, Significantly from north to south.