激光等离子体推进机理是激光推进技术的关键。基于平均原子(离子)模型(AAM)和碰撞辐射平衡模型(CRM)，对激光与等离子体相互作用过程进行了耦合计算，得出了一些特性参数。激光打碳靶实验结果验证了模拟结果的正确性，表明激光双脉冲打碳靶比单脉冲多产生最高为50%的冲量耦合系数，有利于激光推进。这为激光等离子体推进的进一步研究提供参考。

Laser sustained plasma (LSP) propulsion mechanism is the key to laser propulsion technology. On the basis of the average atom (ion) model (AAM) and the collision radiation model (CRM), the interactive process between laser and plasma is simulated by coupling method to obtain some characteristic parameters. The experimental results of laser shooting carbon target prove the exactness of simulated results, and show that laser dipulse shooting carbon target can produce more impulse coupling coefficients by 50% at maximum than that by single pulse, which is favored to laser propulsion. This meaningful work will provide reference for further investigation on laser sustained plasma propulsion.