In this article, taking the motor shaft and flange plate as the research object, using the finite element method and solid elements, make a simulation analysis of the motor shaft which contains scratches on the condition of actual working speed and pressure. Through the analysis we get that the scratches affect the output of the torque. The width of the scratch increases, the output of the torque will be reduced. And through the relative motion state between the motor shaft and flange plate we get a conclusion. The larger the scratches, the relative sliding between the shaft and the plate will be more easy happen and the relatively friction come into being. Then the scratches continue to expand. At the same time, the increase of the width of the scratches will cause stress concentration, and make the fatigue failure of the shaft easy to happen. So we should take measures to prevent the expansion of？the scratches in time.%本文以电机轴与法兰盘为研究对象，采用有限元法，使用实体单元，在实际工作转速和压力条件下对含有划痕的电机轴进行了模拟分析，通过分析得出，随着划痕宽度的增加，扭矩的输出会减小；划痕越大，轴与盘之间越容易出现相对滑动，产生相对摩擦，是划痕继续扩大；同时划痕宽度增加还会产生应力集中，容易使轴发生疲劳破坏，所以应该及时采取措施来防止划痕的扩展。
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