本文通过一道竞赛题介绍了计算振动周期的几种有效解法,有的方法较基础,有的方法较巧妙,为实际问题周期的计算拓展了思路. In this paper, we introduce several effective solutions to calculate the vibration cycle through a competition question. Some methods are more fundamental than others, and some methods are more ingenious, which extends the train of thought for the calculation of the actual problem period.