建立了满足载人登月任务约束的绕月自由返回轨道设计模型,将解析法和数值法有效结合起来,提出了一种从初步设计到高精度设计的串行轨道设计策略,仿真结果表明此方法具有求解精度高,计算速度快的特点.通过大量计算仿真,对自由返回轨道的可达月球轨道参数、返回参数、转移速度等轨道特性做出了分析,为载人登月任务轨道方案的制定提供参考. A lunar orbit free return orbit design model is established to meet the manned lunar mission constraints. The analytical method and the numerical method are effectively combined to propose a serial orbital design strategy from preliminary design to high precision design. The simulation results show that this The method has the characteristics of high solution accuracy and fast calculation speed.A lot of simulation calculations are carried out to analyze the orbital characteristics of reachable lunar orbit parameters, return parameters and transfer velocities of free return orbit, Develop a reference.