Finally, these methods will be applied to the control system of the turntable. Firstly, we will introduce the research background, development history of turntable, the basic knowledge and development of switching control, the basic knowledge and research situation of saturation term. 首先,简要的介绍了问题的研究背景、国内外转台的发展历程、切换控制的基础知识及研究现状,饱和问题的基础知识及研究状况。