Abstract: Described here in the essay are the technical requirements for the seamless steel tube for large-capacity gas cylinder service as specified under applicable National Standard.Also detailed are the domestic conventional manufacturing processes for such tubes.Thanks to the continuously-made technological progresses in the very field, the product size range is being expanded, the product comprehensive performance and manufacture precisions are remarkably improved, and the production costs have been reduced.Based on the analysis the development trend of the said tube for large-capacity gas cylinder service is pointed out, i.e., developing new material with support by technological progress and technical innovation, employing the latest steel-making and steel-rolling processes, and the advanced seamless steel tube manufacturing processes to produce the seamless steel tube, promoting the light-weight development of the seamless steel tube on the premise of guaranteeing safety and liability of the product.