In the baking process of color coated plate, the plate temperature increases gradually, so that the solvent in the coating can volatilize and gradually crosslink and cure completely. Since the temperature of each section of the curing furnace can be controlled separately, the strip steel can finally reach the PM t value through different temperature rise curves. However, the temperature of the first and second sections of strip steel of the furnace is usually controlled to be slightly lower, so that the solvent in the paint film can be fully volatilized before the paint film is cured. If the temperature rises too fast, the solvent in the coating overflows too fast, or the solvent in the paint film is too late to volatilize, the paint film has been cured, which will cause defects such as bubbles on the surface. In the third and fourth sections of the furnace, the temperature of the strip steel is slightly higher than the curing temperature of the coating. When the strip steel enters the third stage, the solvent has basically evaporated, and the paint film begins to solidify. At this time, it is mainly the chemical drying process, and the coating is polymerized. Therefore, the hot air circulation should be strengthened to speed up the reaction; However, if the wind speed is too high, it will destroy the balance of each stage in the process of paint film formation, and it is prone to wrinkle, gloss reduction and other defects. In the fifth section of the furnace, the strip steel temperature slightly decreases or remains unchanged, as shown in Figure 2. If all temperatures are the same, that is, the temperature of the strip steel shows a linear upward trend. Although the strip steel can finally reach the curing temperature, the wear resistance and solvent resistance of the coating will be reduced due to the short time at this temperature and low crosslinking density. Baking curing temperature also has an effect on other properties of color coated board. After coating a sample, control different PM t temperatures to improve the properties after curing.It can be seen that with the increase of baking temperature, the gloss of the coating decreases, the hardness increases and the T-bend decreases. This is because with the increase of curing temperature, the crosslinking curing degree of the coating increases and the compactness of the coating increases, so that the M EK wiping resistance, hardness and scratch resistance of the coating improve, while the T-bend performance decreases. Therefore, the fluctuation of strip PMT should be controlled in production to ensure the stability of coating performance.