Effects of multiple corona reactor modes on pulse characteristics, energy transfer efficiency, and odor (H2S and NH3) removal were investigated experimentally by the wire-plate corona reactor(s). The removal efficiency of H2S was only 91% and the energy consumption was 16.1Wh m(-3) by the single mode with a gas-flow rate of 23m(3)h(-1) and an initial concentration of 200mg m(-3). At the same experimental conditions, almost 100% removal efficiency was achieved and the energy consumption was only 12.8 and 14.9 Wh m(-3) by the series and parallel modes. In the case of 50 mg m(-3) NH3 removal at the same gas-flow rate, the removal efficiencies with the single mode, the series and parallel modes were 64, 92 and 70%, respectively. The energy requirement did not increase at the same residence time under the experimental conditions of the single mode with a gas-flow rate of 11.5m(3) h(-1) and the series or parallel mode with a gas-flow rate of 23.0m(3) h(-1). The experimental results indicate that the series and parallel modes are effective in saving energy consumption, improving removal ability and efficiency, especially for the series mode.