Initial shifting amplitude determines the distribution range of the shifting position on theentire rolling schedule and the wear distribution range of the work roll, which has great influence on reducing the height of the 'cat ear'. In the mechanical adjustment range of the equipment, the larger shifting amplitude will make the roll wear more uniform when rolling the same strip number. However, the larger amplitude can cause a large shifting step size near the zero position, which is determined by the nature of the sin function. In the hot rolling process, work rolls have a high temperature, and there is a difference in the temperature of each position of the roll along the axis of the roll. The temperature at each point of the work rolls is inversely proportional to the distance from the centreline of the strip. The greater the distance, the lower the temperature. Therefore, when the shifting amplitude is too large, the distance of the work roll for a single movement is increased. The thermal roll contour of the work rolls changes drastically, which will affect the control of the strip profile, including strip crown, wedge and edge drop and even affect the stability of the roll.