for obtaining a plasma working gas to be filled in at a rate of o 2 he or o 2 ar not smaller than 10 and a flow ratio of 4 slm a power density is increased to not smaller than 0 9 w cm 2 for generating an atmospheric filamentary discharge plasma to be irradiated on the polymer fabric for activating and roughening the substrate therein through a local heat effect of the atmospheric filamentary discharge plasma a surface of the polymer fabric is etched to form a rough surface with a high roughness where the power density is adjusted for 3 to 5 minutes min to obtain the required roughness of about 26 nm the activated and roughened surface of the substrate thus obtained is highly hydrophilic with its contact angle of water droplet and oil droplet to be decreased to 40 u00b0 and 5 u00b0 respectively then the polymer fabric being irradiated by the atmospheric filamentary discharge plasma is exposed to air for 6 min to form highly active peroxide on the rough surface of the polymer fabric the polymer fabric with peroxide is immersed in the solution of fluorocarbon compound for 3 to 5 min for a first stage of graft of fluorocarbon monomers the peroxide of the substrate grafts monomers of pfdmcs to form a grafted fluorocarbon monomer layer on the rough surface of the polymer fabric.