A continuous one-stage method for fabrication of modified viscose fibre containing quaternary ammonium groups was developed. Ways of increasing the CMGP were defined. It was shown that CMGP increases sharply on simultaneous addition of Na2SO 4 and MBAA (N,N'-methylenebisacrylamide) (MBMAA: N,N'-methylenebismethacrylamide) was developed. A viscose fibre containing up to 80 wt. % graft PDMVPMS with CMGP of up to 98 % was obtained. The efficiency of ion-exchange cellulose fibre materials (CFM) for different purposes is well known [1-3]. The expediency and technical and economic efficiency of using materials containing ionizable groups are determined by different factors, but simplicity of fabrication is one of the most important. Of the different types of CFM containing basic groups, CM-A2 fibre, fabricated by a two-stage periodic method by graft polymerization of 2-methyl-5-vinylpyridine with subsequent quaternization of the nitrogen atom of tertiary amino groups with epichlorohydrin, has been most widely used [4]. The study described here was conducted to develop a method for fabrication of an anion-exchange fibre containing quaternary ammonium groups which could be done according to a one-stage continuous scheme. 1,2-Dimethyl-5vinylpyridinium methyl sulfate (DMVPMS), which is a water-soluble, nonvolatile monomer with low toxicity manufactured in Russia, was used for modification of CFM. We previously [5] investigated the characteristics of modification of viscose fibre by graft polymerization of DMVPMS according to a method based on the reaction of chain transfer from initiator radicals, where diffusion of the initiator into the solution of monomer is hindered. To fabricate the anion-exchange fibre, viscose fibre (in the form of a twist) was impregnated with an aqueous solution of DMVPMS containing ammonium peroxydisulfate (APS) for several seconds, squeezed, heated in an oven at 100-140°C for 10 min, washed with water, and dried. It was shown in [5] that adding NaCI to a solution of the monomer containing APS increases conversion of the monomer in the graft and homopolymerization (CMGP and CMHP) reaction by approximately two times, while addition of Na2SO 4 sharply increases the amount of homopolymer due to formation of associates of Na2SO 4 with molecules of DMVPMS and poly-l,2-dimethyl-5-vinylpyridinium methyl sulfate (PDMVPMS), an increase in the viscosity of the system, and a decrease in the rate of the chain-breaking reaction. The possibility of increasing CMGP by adding a bifunctional comonomer capable of forming a sterically cross-linked copolymer with the cellulose macromolecule and graft DMVPMS to a solution of DMVPMS was examined in the present article. Since inorganic nonpolymerizable electrolytes (NaC1 and Na2SO4) have an important effect on graft polymerization, the possibility of increasing the CMGP of DMVPMS by simultaneously adding a nonpolymerizable electrolyte and a bifunctional comonomer to the solution of monomer was also investigated. Water-soluble N,N'-methylenebismethacrylamide (MBMAA) was used as the bifunctional comonomer. The amount of DMVPMS applied on CFM was determined* after extraction of the monomer and homopolymer with water to characterize graft polymerization and the composition of the modified CFM. The concentration of unreacted monomer and water-soluble homopolymer (CHP) after the graft polymerization reaction was determined by analyzing their concentration in the aqueous extract by spectrophotometry at k = 250 and 275 nm and was calculated with specially derived equations. CMGP and CMHP were calculated with the results of these analyses. The amount of MBAA (MBMAA) applied to CFM and not reacting was determined in the aqueous extract by spectrophotometry at k = 210 nm. The modified CFM prepared with this method