Abstract: By means of source rocks pyrolysis, organic ma tt er abundance and hydrocarbon-generating potential, organic matter type have sys temically been studied, it is indicated that coal and carbonaceous mudstone in Taiyuan Formation, Benxi and Shanxi Formation are not hydrocarbon-source rocks; agreat number of coal -bearing mudstones contain weak-mid hydrocarbon-source rocks in Shanxi Format ion, then that of Taiyuan Formation belongs to non-hydrocarbon-source rocks. Thermal evolution effect on organic carbon abundance and hydrocarbon-producing po tential is negligible, at the same time, organic carbon abundance is positive wi th hydrocarbon-producing potential. Taiyuan and Benxi Formation source-rocks is humic kerogen; one sample in Shanxi Formation is sapropelic-humic kerogen, ot her samples belong humic kerogen.