To reveal the hydrocarbon accumulation law in Chengdao buried hill and thus optimize favorable targets for oil and gas exploration in the buried hill，we systematically studied the fine oil-source correlation，reservoir characteristics，and hydrocarbon migration and accumulation in Chengdao buried hill，depending on organic geochemistry，isotope，and physical properties of crude oil. Research demonstrates that Chengdao buried hill is governed by Fault Chengbei 20 and North Fault Chengbei 30，which is divided into three zones：west，middle，and east buried hills. Influenced by accumulation conditions such as source-reservoir configuration and migration patterns，the sources，migration，accumulation and enrichment of hydrocarbon in the three zones are different. Fault Chengbei serves as the oil source for west buried hills，which connects with the source rock of Chengbei Sag and traps hydrocarbon（mainly migrating and accumulating vertically）in the faulted nose and faulted blocks on the uplifted side. The oil-bearing area is small and independent，and the top weathering crust is enriched by hydrocarbon. In middle buried hills，Fault Chengbei 20 and a series of NNE strike-slip faults can transport oil from sources. Oil and gas generated in Bozhong Sag migrate and accumulate along the strike-slip fault and then travel laterally to the adjacent traps for accumulation，presenting as an overall distribution along large-scale strike-slip faults. Moreover，in east buried hills，oil and gas originate from source rocks in the Lower Submember of the third Member of Shahejie Formation in Huanghekou Sag. They are enriched in multiple strata through diversified sets of composite transport systems consisting of unconformities and faults. Differential hydrocarbon migration and accumulation in buried hills determine their orientation of exploration.