Gufengzhuang-Hongjingzi area which local in western margin of Ordos Basin span two tectonics of the thrust belt on the western edge and Tianhuan depression. By seismic interpretation, strata and structure correlations and core observation, two types of faults were found in study area. The early reversed fault is located at the west of the study area, and N-S and NW-SE trending, the late normal fault located at the middle, NW-SE trending. The time and space of Tianhuan depression and hydrocarbon-generating peak of Chang 7 hydrocarbon-generating rocks are matched which promotes the hydrocarbon lateral migration and accumulation. Three types of petroleum accumulation were discovered including early nose-like uplifts accumulation, the thrust belt on the western edge accumulation and late normal fault of Tianhuan depression accumulation. The first two types were formed in Early Cretaceous that forming time is earlier, as the original reservoir; the latter forms the Himalayan period, the forming time is late, is a modified form of reservoir. The formation of fault readjusts the reservoir, and causes the reservoir beneath the fault damaged. The accumulation model of Chang 9 reservoir was built in Gufengzhuang-Hongjingzi area. The law of oil migration can be summarize as following: the fault is the passage, abnormal pressure and driving of bottom-water buoyant are the force, widely connecting sand body is the carrier, mudstone and fault block and structural high are the ultimate goal.