Abstract: In this paper,the TiO₂ coating electrode having a good photocurrent-potentail property has been discovered by varying the quantity of auxiliary gas (H₂),the pressure of spraying chamber and the heat treatment temperature of the coating,etc.,in spraying TiO₂ coating with low pressure condition plasma.By analysing the structure of the coating,it has been showed that the photocurrent-potential property of TiO₂ coating depends on the structure of the coating.When there are appropriate Ti₃O₅ and Magnel phase in rutile TiO₂ coating,rutile TiO₂ coating will show an optimum photocurrent-potential property directly proportional to light intensity.If the coating consists of rutile TiO₂ or Ti_2O_3,Ti₃O₅ and Magnelis phase,its photocurrent-potential property will disappear.