Abstract:In recent years, the discovery of Chang 9 Member high-quality hydrocarbon source rocks and the good hydrocarbon show and the gain of commercial oil flow in Chang 8, 9, 10 Reservoir , which indicate Chang 9 Member may be a set of important potential hydrocarbon source rocks. Therefore the hydrocarbon generation potential of hydrocarbon from source rock of Chang 9 Member was researched qualitatively and quantitatively in this paper. The result indicated that the quality source rock of Chang 9 Member, Yanchang Formation, Ordos Basin is mainly distributed in Zhidan and Yingwang areas. Hydrocarbon resources from source rock of Chang 9 Member in Ordos Basin are (2.09~4.17)?08t and (0.06~0.12)?011m3 . Because of the low expulsion efficiency of hydrocarbon in Yingwang area hydrocarbon resources mainly concentrate in Zhidan area. Therefore, hydrocarbon resources from source rock of Chang 9 Member should be considered when oil and gas exploration is conducted in Zhidan area.