By analyzing the platinum channel material and performance, heating method, control mode, transformer design, etc. of the TFT-LCD glass substrate production line, the method of adjusting the heat flux of the platinum channel quickly was studied. Based on the primary side or the secondary side tap structure, we can select the heating of the platinum channel mode, adjust the output voltage of the transformer through combined taps, and control the temperature of the platinum load accurately, which can meet the needs of different loads. When the transformer was equipped with a gear switch, simple and quick adjustment of voltage output can be got and the output voltage was adjusted randomly and accurately to solve the problem of low electric energy efficiency. So the rapid adjustment of heat flux was achieved and power efficiency was improved.