Copolymerization of acrylonitrile (AN) with acrylamide (AAm) in concentrated aqueous solutions of inorganic salts，such as 52％ NaSCN，60％ ZnCl2，34％ Mg (ClO4)2， and in various concentrations of aqueous solution of NaSCN at 60±0.1℃．initiated by azo-bis-isobutyronitrile，has been studied．It has been found that the monomer reactivity ratios of the monomer pair in various concentrations of inorganic salt solutions are almost similar to one another and also similar to the result obtained from the copolymerization carried out in water medium as reported by Reicherr．Copolymerization of Acrylonitrile with methyl acrylate (MA) in 52％ NaSCN and 64％ ZnCl2 has been also studied．Results show that the composition of AN-AAm，AN-MA Copolymers at any degree of oolymerization conversion is approximately in agreement with the results calculated from the Skeist equation．