The energy transfer efficiency from pulse generation circuit to corona discharge reactor was investigated. To find the optimum energy transfer condition, we varied the value of the pulse-forming capacitor in pulse generation circuit. Maximum energy transfer from pulse generation circuit to corona discharge reactor was achieved when the ratio of the pulse-forming capacitance to the geometric capacitance of the reactor was around 3.0. From the analyses of the voltage and current waveforms, we found that the capacitance of the reactor increases about three times, due to development. This increase is the reason why the maximum energy transfer occurs when the pulse-forming capacitance is three times larger than the initial capacitance of the reactor. The energy consumption for removal of nitric oxide was also minimized at this capacitance ratio.