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The experiments of arsenic removal from flue gas were investigated at a lab-scale bubbling reactor with H 2 O 2 solution to develop a novel oxidation process. The effects of various experimental parameters, such as H 2 O 2 concentration, initial solution pH, reaction temperature, and flue gas components (O 2 , CO 2 , SO 2 , and NO) were systematically investigated, and the average removal efficiency was found to be 92.6%, under the obtained optimal conditions, in which H 2 O 2 concentration was 0.2 mol/L, solution pH was 5.0, and reaction temperature was 50 °C. Meanwhile, the mechanism of the reaction was proposed based on characterizations of the removed products by high performance liquid chromatography coupled to hydride generation atomic fluorescence spectrometry, atomic fluorescence spectrometry as well as a review of the literature.