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In order to describe the effect of the filling of reservoir bitumen on reservoir physical properties�� the authors take the reservoir bitumen in Fuyu oil layer reservoir as the research object�� The characteristics of reser- voir bitumen were analyzed through polarizing microscope��fourier infrared spectrum and inclusions�� The results show that reservoir bitumen appears as brown�� black and opaque dark materials in sandstone�� and is developed with the content of 1% ��16% in feldspar lithic sandstone and lithic feldspar sandstone�� The occurrence is pore filling and followed by the pore wall lining type��and distributed in disperse and oriented states�� The influence of reservoir bitumen on reservoir porosity is 1% ��42%��with an average of 7%�� With the increase of distance from the bottom of the 1 st member of Qingshankou Formation��the content of bitumen presents a trend of decrease�� The existence of reservoir bitumen makes the physical properties of reservoir decreased and the reservoir heterogeneity enhanced�� Thus��the reservoir bitumen is one of the important controlling factors for reservoir densification��