Macromolecules chain transfer agent(PMAM-CTA) was synthesized through the Reversible addition fragmentation chain transfer polymerization(RAFT) polymerization by using(BDATC) as the chain transfer agent,methyl acrylamide(MAM) as the first monomer.The derived well-controlled block copolymer(PMAM-b-PVP) was prepared by using the above obtained polymer as macromolecular RAFT agent and NVP as second monomer.N-vinyl-γ-sodium aminobutyrate-sodium acrylate copolymer(VSA-SA) containing-NH2 and-COOH as the CO2 facilitated carrier,a kind of fixed carrier membrane material for CO2 separation,was synthesized by hydrolysis.The chemical composition and structure of chain transfer agent(PAM-CTA),PAM-b-PNVP and VSA-SA were analyzed by FT-IR,1H-NMR,XRD and DSC,the molecular weight and polydispersity index were analyzed by GPC.The polymerization showed "living"/controlled characteristics.Reaction kinetics was first order and linear.Relative molecular mass of polymer was controllable.The polydispersity index of polymer was narrow within 1.2～1.3.Compared with the product obtained by free radical polymerization,the crystallinity of hydrolysis product VSA-SA reduces,and carrier increases.