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There are lots of reasons to restrict a low-permeability oil layer to enhance the recovery factor.Based on the research results of non-Darcy flow, microfiow of water drive and micro-acting force in low permeability porous media are studied by establishing the expression of fluid viscosity factor.Numerical calculation shows that under the condition of L/S interaction, the radial velocity distribution near the solid wall changes obviously, and the curve form changes from convex to concave.The tinier the capillary radius is, the stronger the L/S interaction is.The larger the n value is, more obviously the flowing velocity decreases.The results will help people to deal with improving recovery factor of low permeability reservoir, and understanding the fluid How behavior in blood capillary.