描述了管内发射两级火箭的发射过程，将该发射过程分为4个阶段.对二级火箭的点火时间进行分析，设计并完成了二级火箭在管内与管外2种情况下开始工作的对比试验.结果表明，管内发射两级火箭的发射原理是可行的，该发射方式可提高火箭弹的速度.

The launching process of two step rocket inside the tube was described, and the launching process was divided into four steps. Ignition time of the second solid propellant was analyzed. The contrast experiment of its starting work inside the tube and outside was designed and accomplished. The results show that launching of two step rocket working inside the tube is feasible, and the launching mode can increase the rocket velocity.