Abstract: Based on the"pre-survey of Juhugeng coal mine in Tianjun County, Qinghai Province" and the simulation research on the distribution characteristics and hydrocarbon-generating process of the source rocks, it is considered that there are three kinds of source rocks:coal, dark mudstone and oil shale.The coal seams are mainly distributed in the upper section of Muli formation; dark mudstone is in the upper section of Muli formation and Jiangcang formation;oil shale is mainly distributed in the upper section of Jiangcang formation. Two hydrocarbon-generating processes of the source rocks are late Jurassic-early Cretaceous andearly Paleogene with the former being the mainhydrocarbon-generating stage.