Abstract:Influence of the filler, smoke inhibitor and application rate of the coating on the fire retardant properties of the coatings were studied. The results showed that the inorganic fillers, such as zinc oxide and aluminium oxide, not only can increase the strength of intumescent layer, but also have good smoke inhibit effect. When the application rate of the coating is 500 g/m 2, the fire retardant effect of the coating is the best.