Hydrogen peroxide is measured by chemical method in pulsed discharge in distilled water. Variation of the length of streamer is researched by taking photos. It is found that with increasing of gas-flow rate and discharge time

quantity of hydrogen peroxide increases gradually when nitrogen and oxygen is inlet respectively. When the distance of electrode is 5 cm and the applied voltage is 35 kV

the quantity of hydrogen peroxide formed in nitrogen-water mixture discharge is more than that in oxygen-water mixture discharge

and the streamer in nitrogen-water mixture discharge was longer than that in oxygen-water mixture discharge. However

when the distance of electrode is 3 cm

applied voltage is 21 kV

that formed in oxygen-water mixture discharge is more than in nitrogen-water mixture discharge

and the length of the streamer varies little.