In the manufacture of flat panel display glass, platinum channel is used to transport molten glass, which will suffer oxidation loss when it works at a temperature above 1 400 ℃ for a long time. At the same time, H+ generated by water decomposition in the glass melt is released to the outside through the wall of the platinum channel, and O2- enriched in the glass melt will form a certain amount of bubbles. In order to protect the platinum channel and improve the glass quality, a coating of ZrO2-Y2O3 is sprayed on the surface of the platinum channel by plasma spraying. The bonding strength between the coating and the platinum channel is more than 50 MPa, which reduces the oxidation loss rate of the platinum channel by about 75% at the service temperature, and has good high-temperature adaptability with the refractory coated by the platinum channel.