In view of the problem of seepage law which does not agree with the Darcy law,in this paper,both capillary experiment and core flooding have been made.The experiment of boundary layer in capillary and the influences of boundary layer on the porous flow in low permeability core are made.Finally,Factors affecting boundary layer are studied systemically.The results will have directive significances on the study of Non-Darcy porous flow in low permeability oil reservoir.