Abstract: Applying characteristic analysis,the authors of this paper set up an optimum mod- elling formula of the Fuyu oil reservoir from the study areas of the Xinmin and Fuyu Oil-fields in the Songliao Basin。In this modelling formula seven significant geological vari- ables are selected with various weighed coefficients.According to the value of weighedcoefficients,it is revealed that oil/gas accumulation should be predominantly controlledby the distance from oil-generating center of depression to the accumulation,hydrocar-bon expulsion of the lst section of the Qingshankou Gr.(Fr.)and sedimentary facies inplace rather than other factors.Combined with physical analysis,it is believed that thebest oil/gas prospects in the Fuyu oil reservoirto be located in the Longhupao-Daan ter-race,of which the south area is in the central south of the Huazijing terrace and thewestern clinoform zone of Fu-Xin uplift.