Amphiphilic block copolymers were synthesized by RAFT polymerization using S, S-dibenzyltrithiocarbonate ( DBTTC ) as chain transfer agent, acrylamide ( AM ) as the first monomer and vinyltriethoxysilane ( VTES ) as the second monomer. The aqueous solution can be used as an aerosol fixer for the removal of radioactive aerosols in nuclear-related environments. The molecular structure and properties of the polymer were characterized by FTIR, 1H NMR, DSC and GPC. The results of viscosity characterization showed that with the decrease of and viscosity of the polymer increased with the decrease of the amount of chain transfer agent. The test results of surface tension and contact angle showed that with the introduction of VTES, the surface tension decreased to 40.44 mN / m ; the contact angle was reduced to 11.9°; the aerosol settling fixation experiment showed that the settling fixation efficiency of PTI-A2 dust was 91.04 %. It is expected to be applied as radioactive aerosol settling fixative in nuclear-related environment.