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In this paper, some characteristics of a method for decomposing organic compounds by spraying a water solution of organic compounds as droplets into pulsed streamer discharges in air are presented. For the characteristics, the effect of spraying the water droplets compared with water film flowing in a chamber wall, and locations of water droplets into the discharge area on water treatment by the pulsed discharge in air was investigated. In the experiments, a coaxial electrode was used. A solution of organic dye, indigo carmine, was used for a sample. Experimental methods of the effect of spraying the water droplets were to sample each solution gotten through the discharge area as water droplets and water film. Experimental methods of the effect of locations of the water droplets were to spray the water droplets near the wire electrode or the cylindrical electrode. The time spent for decolorizing the water droplets, including indigo carmine, was 0.57 times shorter than that flowing along the inner wall of a reactor into the discharge. This result shows that spraying as water droplets into the discharge in air is effective for faster treatment of water. The time spent for decolorizing the water droplets, including indigo carmine, at the location near the cylindrical electrode of the reactor was 1.5 times faster than that at the location near the wire electrode of the reactor. This result shows that the location near the cylindrical electrode of the reactor has many radicals that are effective for degradation of organic compounds.