In this paper, the cooling bed bar line automatic control cycle using sequential control, speed control and sequential control, control Angle of cooling bed, location and cycle control, driven by two electric motors synchronous cooling bed. Adaptation to improve the production efficiency and improve rolling rhythm and the demand of the slit rolling, rolling and adapt to the rapid segmentation multi-line rolling, cooling bed has the rapid cooling, short cycle, the function of the counting precision, improve the quality of rolled pieces.