Abstract: In order to meet the required simulation precision and meet the real-time simulation in ballistic simulation calculation，this paper analyzes the selection method of the simulation step，and then introduces variable step integration methods in Runge-Kutta to Adams and educes Adams variable step integral formulas，and then put forwards a method by seeking zero of condition function in discontinuous nonlinear system of the ballistic simulation.The simulation results show that using this method can obtain high simulation precision and fast run speed.

Key words: ballistic simulation, numerical calculation, simulation step, discontinuous nonlinear system, condition function

摘要： 在弹道仿真计算中，为了既达到要求的仿真精度又能满足实时仿真，分析了仿真步长的选择方法，然后在龙格－库塔转阿当姆斯法中引入变步长积分方法，推导了阿当姆斯变步长积分公式，同时对弹道仿真中的间断非线性系统提出条件函数求零的方法来解算弹道。仿真结果表明，方法可以获得较高的仿真精度和较快的运行速度。

关键词: 弹道仿真, 数值计算, 仿真步长, 间断非线性系统, 条件函数