Abstract: Due to the exsistence of large variable-time delays, nonlinearities and multivariable disturbances in the hot galvanizing coating thickness control processes, seriously coating weight error and nonuniform coating may usually happen. Based on the relative analysis of coating weight with air knives pressures, distances between air knives and strip speed, the model of adaptive feed-forward control and model-free adaptive feedback control were presented to control automatically air-knives pressure and position. An accurate and uniform zinc coating weight control is proposed and implemented. Simulation result showed that the precise and intelligent control schemes resolve effectively the above difficulties contrasting to PID control. The adaptive control model used in product application not only satisfy high quality control requirement but also change from manual adjustment to the automation control on coating weight.