||The most recent studies to produce anion exchange materials has greatly favored the bromination reaction, one of conventional methods for introducing cationic group. The main advantage of the bromination reaction is that it allows for a nearly quantitative conversion of precursors as well as fast reaction rates. However, various limitations of bromination reaction still existed such as unpredictable dibromination and chain scission. Accordingly, our research focused on overcoming the limitation of bromination reaction by controlling reaction conditions. Herein, a series of polymer containing a benzyl bromide group were synthesized using bromination reaction under various reaction condition. In particular, we measured a nuclear magnetic resonance (NMR) spectroscopy, gel permeation chromatography and physical properties of synthesized polymer.