Strong heat and mass transfer capacity, narrow stop time distribution, extremely high specific surface of heat exchange and diffusion, continuous operation mode, and unique advantages for reaction systems with harsh conditions such as high viscosity and high temperature. Continuous polymerization reactive extrusion such as pur, PA, POM, Pei (polyetherimide), PC, PMMA, PBT and PPS, and reactive extrusion such as dynamic vulcanization, crosslinking, grafting and chain extension.