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- In this paper, fluorescent discharge type ozonizer has been designed and manufactured. Ozone discharge and generation characteristics have been investigated in accordance with a sort of internal electrodes, output voltage of power supply, air flow rate and discharge power. Air has been used as the supplied gas of the ozonizer. In this paper, when disuse fluorescent lamp was used as an internal electrode. Air flow rate was varied from 2[l/min] to 10[l/min]. The maximum ozone concentration and yield were 3495[ppm] and 23.4[g/kWh] respectively at 2[l/min] air flow rate and 35.2[W] input power. Illumination was appeared as 5[lx] within 15[cm] from external electrode. When fluorescent discharge type ozonizer was used, air flow rate was also varied from 2[l/min] to 10[l/min]. At this moment, the maximum ozone concentration and yield were 2824[ppm] and 21.7[g/kWh] respectively at 2[l/min] air flow rate and 30.5[W] input power. Illumination was also appeared as 5[lx] within 15[cm] from external electrode like used fluorescent lamp.