由日常生活中的脸盆或圆盘旋转落地问题抽象出薄圆柱落地问题，这个问题解析求解困难，但物理图像十分有趣.本文用不同的近似方法逐渐逼近实际情况，通过数值模拟展现了该运动图景.薄圆柱落地前一段时间的运动可以近似为定点转动，研究发现与实际符合得较好.然而实际过程又不完全是定点转动，因此研究了刚体一般运动并得到有趣的结果.初始自转、进动和章动角速度塑造了运动的形态，摩擦力在实际运动过程中发挥着损耗物体能量的重要作用.

The landing problem of a thin cylinder is abstracted from the spinning-landing process of a washba- sin or a round plate in everyday life. This problem is analytically difficult but has a fascinating physical picture. In this paper，different approximate methods are used to gradually characterize the actual situation. The motion is shown using numerical simulation. The initial motion of a thin cylinder before it falls onto the ground can be approx-imated as a fixed point rotation and in good agreement with the reality，however，the whole motion is not fix point rotation completely. So the general motion of this rigid is studied which leads to interesting results. The initial angu- lar velocity of precession and nutation sculptured the state of motion，while force of friction plays a vital role in cau- sing energy loss of the system.