Abstract: Boiling fluid inclusions were identified in the hydrocarbon reservoirs of the Dongying Depression.These inclusions were found first time in the rift basins of China,and it provided very important evidences for the pulsatile-or paroxysmal-typed entrapment of underground hydrocarbon fluids.In this paper,the characteristics of boiling fluid inclusions in the study area and their relations to the entrapment of hydrocarbon fluids are introduced,and the paroxysmal-typed entrapment model of hydrocarbon related to faults and sandstone lens are discussed,respectively.