Graft reaction of the acryloyl chloride on polyvinyl alcohol in dimethyl sulfoxide was studied.The effect of concentration,temperature,time on grafting rate were discussed.The results showed that the best grafting condition:n(PVA) ∶n(acryloyl chloride)=1 ∶1,at 50 ℃ for 2 h.The graft copolymerization was analysed by UV,FTIR and 1H NMR.