Trajectory design is a fundamental problem faced by manned lunar landing missions, which might directly affect the performance of the mission, even determine its success or failure. The design methods and related results of domestic and foreign researches on manned lunar trajectory are summarized, the characteristics of three kinds of manned lunar landing trajectory including free-return, hybrid and abort trajectory are analyzed, and a variety of design methods, constraints, optimization principles and mission mode of the direct transfer trajectory are presented.%轨道设计问题是载人登月任务面临的一个最基本的问题，设计的优劣直接影响任务执行的效果、甚至成败。总结了国内外载人登月轨道设计的方法以及相关的研究成果，分析了载人登月自由返回轨道、混合轨道和任务中止轨道等三种类型轨道的特性，详细介绍了直接转移轨道设计的多种设计方法、约束条件、优化原则和飞行模式。
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