Abstract: In this paper,the components of aromatic HC in source rocks are analyzed by GC-MS. According to the general fromula C_nH_2n-p(P: 6, 8, 1,0……20),11 Series of aromatic HC are identified and more than 200 mass peaks are calculated. The component and the total carbon number distribution of aromatic series compounds in source rocks with various source type and maturity are listed to provdied data for further understanding of the thermal evolution of source rocks.