Based on the filling pattern of sandstone reservoir, according to the minor variation of crude oil maturity in reservoir, the filling pathway has been traced with maturity contour. The peak of maturity contour refers to the advanced pathway for petroleum migration and filling. 17 samples from Fuyang oil layer have been analyzed, indicating that crude oil maturities all over the Wangfu Sag have the same feature. Well Shuang32 is the filling point which is close to source kitchen. There are 3 advanced migration and filling pathways in the study region.