Abstract: s:The Xujiahe Formation in center of Chuanxi foreland basin is an important coal bearing strata and possesses a few series hydrocarbon source rocks. Based on the result of sediment organic carbon approach, the organic material is abundant in source rocks, organic type is principal type III, minor constituent is type II. The maturity degree of source rocks is high, but quality diversity exists within different source rocks. Organic carbon figure also severe change within source rocks. Exploration complexity is attributed to tectonics evolutionary pattern of foreland basin. Available knotty problem about exploration situation require petroleum resources theory, technology, operating position manipulation, together with carefully research about source rocks characteristics, foreland basin evolutionary.