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Bromobutyl rubber(BIIR),an important synthetic rubber,not only maintains many desirable characteristics of traditional butyl rubber(IIR),but also has faster vulcanization rate.However,there still exists two critical problems in the process of brominating IIR in n-hexane,that are strong corrosion caused by Br2 and HBr and low selectivity of target product.A PTFE-lined microreactor platform was developed to solve the corrosion problem.And a water assistant technology was successfully implemented in the microreactor system to remove HBr from the reaction system in time to get high quality BIIR.The results showed that adding a little amount of water into the IIR solution contributed to obtaining high selectivity of demanded molecule structure and low temperature was crucial to get high-quality product.