论述了长征三号系列运载火箭诞生的背景、设计思路、总体技术方案、应用发射结果及其在技术与研制工作方面的特点，展望了其发展前景，指出该系列运载火箭是我国目前性能先进的大型主力商业应用发射火箭群体。

The background, design approach, system engineering, launch results and technical & development characteristics of LM - 3 series launch vehicles are presented, and the development of launch vehicles in the future is prospected. It is indicated that with advanced performance, these launch vehicles are the main force of commercial heavy lift in China.