Abstract: The surface sediments in the south of Jiaozhou bay are studied in this paper, by using the technique of Gas Chromatography-Mass Spectrometry (GC-MS), the parameter characteristics of the normal alkanes, polycyclic aromatic hydrocarbons, steranes and terpenes are studied.Results show:the carbon number of alkanes in the surface sediments of the South Sea area of Jiaozhou bay is from C₉ to C₃₄, all two peaks are distributed.The main peak carbons are C₁₇ and C₂₇, and the peak abundance is much higher than that of the previous peak.The PAHs in sediments may be mainly derived from the input of petroleum and its derivatives.In recent years, the source may be dominated by the burning of fossil fuels, and the oil products become to the main input.The Ts/Tm in the south of the Gulf of Jiaozhou indicates the characteristics of the oil input.C₃₁αβ(S/(S+R)), C₃₂αβ(S/(S+R)), C₃₃αβ(S/(S+R)), C₂₉ααα(S/(S+R)) are from 0.61 to 0.63, 0.42 to 0.58, 0.64 to 0.71, 0.46 to 0.58 respectively, which shows the characteristics of high maturity.