本文讨论中子动力学方程的计算方法。常规的数值积分方法求解中子动力学方程只能选取极小的时间步长,因为它是一个刚性方程。根据离散相似原理导出了微分方程式的差分表达式,时间步长可以大大地增加,因而节约了大量的计算时间。数字例子证明:尽管所建立的仿真模型比较简单,但却能足以反映出由常规积分方法得到的精确结果。本计算方法可以应用于反应堆中子动态过程的实时模拟 This article discusses the calculation of neutron kinetic equations. Conventional numerical integration method solves neutron kinetic equations can only select a very small time step, because it is a rigid equation. According to the principle of discrete similarities, the differential expressions of differential equations are derived. The time step can be greatly increased, thus saving a lot of computation time. Numerical examples show that although the simulation model is relatively simple to set up, it can reflect the exact result obtained by the conventional integral method. The calculation method can be applied to the real-time simulation of reactor neutron dynamic process