In this paper, the research progressin ultrasound assisted processing of polymer melt was reviewed. Ultrasound showsphysical and chemical effectson polymer melt during processing, resulting in improved processing performance, enhanced molecular diffusion and controllable morphology structure. The force generated by ultrasound induced the chain scission of macromolecules,and then in-situ compatibilization of incompatible polymer and functionalized non-polar polymer(grafting copolymer)could be achieved. The o...