Abstract: The grafting of mixed monomer of acrylic acid and styrene onto linen fabric was carried out by dielectric barrier discharge low temperature plasma treatment,aiming at reducing homopolymer,increasing graft yield and improving the dyeability of the treated linen fabric.The optimum conditions were defined: plasma treatment time(4 min,) discharge voltage(13 kV,) frequency 3 kHz,grafting at (60 ℃.) Infrared spectrum and X-ray diffraction were used to characterize the grafted substrate,and the reaction mechanism was also researched.The results showed that the acrylic acid and styrene mixed monomer is grafted onto the linen macromolecule,and the dye-uptake of the grafted linen fabric for cationic dyestuff is improved.