With the new oil-bearing formations and types of reservoir found in Kendong area in recent years，it is necessary to reconsider the petroleum migration and accumulation law accordingly. The main and priority migration pathway of different oil-bearing formations were studied by using seismic data，geological data and new well logging data of the area. It is shown that there are two different petroleum migration and accumulation sub-systems in the Neogene and the Paleogene respectively. For the Neogene system，the oil and gas migrated laterally through two paths that were strike slip faults and sandstone framework during the tectonic active period，and the paths were named as fault-sandstone system and sandstonefaults system respectively. For the Paleogene system，the oil and gas migrated slowly through the single path that was the unconformity for hydrocarbon transporting laterally during the tectonic stable period，and the path was named as fault-unconformity system. The petroleum migration and accumulation model of“two-story platforms”was built according to the differences of the migration medium and their priority pathway between two oil and gas bearing formations.