The grinding system is the main working part of the mill. Its running stability determines the grinding quality of the mill. Combined the research on the stability of the grinding system in domestic and foreign, this article analyzed the reasons that affect the stability of the grinding system from the aspects of the mill parts accuracy, processing parameters and assembly quality. Moreover, the influence mechanisms of each factor are clarified, and the corresponding solutions are put forward, which can provide reference for the research of grinding stability of the mill.