首先介绍由宇宙射线产生高能μ 子(简称宇生μ 子)的物理过程，再重点关注教学实验室利用延迟符合计数法探测 宇生μ 子的基本工作原理. 其次，利用探测器蒙特卡罗模拟的方法，考虑了完整的物理过程模拟，进行了探测器材料和几何形 状的优化，并实现了探测器模拟结果的输入与输出功能. 最后，讨论了探测器模拟的结果，初步获得了μ 子衰变的谱形，拟合 μ 子寿命符合理论预期值. 在教学实验中，该方法有利于加深学生对宇生μ 子物理过程的理解.

A brief introduction to cosmic muon physics is presented. We focus on the basic principle of coincident counting of cosmic muons in the physics laboratory. We introduce the method of Monte - Carlo ( MC) simulation in particle physic，including selection of physics lists，optimization of detector materials and geometries，inputs and outputs of the simulated data. We also discuss the preliminary results muon decay spectra where the fitted muon life-time matches the theoretical prediction. The established MC simulation tool is of pedagogic significance for it helps better students’insight into the cosmic muon physics.