本工作采用模拟粒子在水蒸气中输运的蒙特卡罗程序,模拟计算了0.3～5MeV质子、α粒子在水蒸气中的径迹结构,记录了相互作用位置的坐标、每次事件中的能量沉积以及相互作用的类型。程序中考虑了弹性散射、电离、激发、电荷转移等物理过程。研究得到了一些有益的结果,为进一步研究粒子致DNA辐射损伤的物理模型奠定了一定的基础。 In this work, a Monte Carlo simulator is used to simulate particle transport in water vapor. The trajectories of 0.3 ~ 5 MeV protons and α particles in water vapor are simulated and the coordinates of the interaction sites are recorded. The energy of each event Deposition and the type of interaction. The program takes into account the physical processes of elastic scattering, ionization, excitation, charge transfer. Some beneficial results have been obtained and laid a foundation for further study on the physical model of particle DNA damage caused by radiation.