Abstract: As 3rd member of Shahejie formation is one of the main hydrocarbon source rocks in Shahejie formation,clear understanding of the characteristics of hydrocarbon source rocks is of great significance for Nanpu sag.With various evaluation methods,through comprehensive studies of organic matter abundance,organic matter type and thermal evolution degree of organic matter,organic carbon content in Linque sub-sag is the highest,S1+S2content in pyrolysis is between0.01~75.69 mg/g,chloroform bitumen " A" content is about 0.149%,mean value of total hydrocarbon content is 1 100×10-6,organic matter type is given priority to Ⅱ2,vitrinite reflectance is mainly within the scope of 0.25% ~1.75%,and the hydrocarbon generation peak is about 4,000 m in depth.These clear hydrocarbon source rock characteristics provide reference for better understanding of hydrocarbon origins,the hydrocarbon prediction and further exploration of Nanpu sag.