We carried out tests on certain incinerator plant for two years from 1993 through 1994, to assure the effect of pulsed corona discharge for removal of NOx and dioxin in hue gas in the small-scale experimental apparatus. The gas volume of the test plant is 50 NM3/H. By the experiment, high performance of dioxin removal at the gas temperature of 150 degrees C was achieved. Regarding NOx, the reduction efficiency of NO was about 60 percents, whereas that of NOx including NO2 was 30 percents at most.