In the extended range improved design of certain type of rocket launcher, in order to solve the problem of severe ablation and low stiffness with the GFRP barrel, present a design scheme of barrel with GFRP and stainless steel, analysis the factors affecting the stiffness of barrel and theoretical calculation were obtained, verified the feasibility of the scheme through ANSYS and ballistic launcher firing test. The results show: barrel with GFRP and stainless steel get good qualities of those materials, can meet the requirements of small weight, rigidity, resistance to erosion and corrosion resistance, the improvement design requirement of target shooting accuracy and range of the ballistic missile are both achieved, provide theoretical basis and reference to engineering application of improved design of barrel in rocket launcher.%某型火箭炮增程改进设计中，在增加身管长度的基础上，为控制身管质量并满足刚度要求，提出玻璃钢身管内衬金属材料的设计方案。分析影响身管刚度的因素并进行理论计算，利用ANSYS有限元软件进行仿真分析，并进行弹道炮射击试验验证。结果表明：玻璃钢内衬金属材料的身管设计方案取2种材料所长，能够同时满足质量小、刚度大、抗烧蚀和耐腐蚀的要求，且弹道炮立靶射击精度和射程均达到了改进设计目标，为火箭炮身管的改进设计提供了理论依据和工程应用参考。
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