Abstract: The phasing orbit design of the lunar orbit rendezvous and docking operation in Chang’e 5 mission is discussed in the paper, with consideration of the uniqueness of lunar orbit rendezvous and docking missions and the practical engineering constraints of China Lunar Exploration Program. The paper addresses the two aspects of the phasing orbit design, namely the phasing orbit designs of the ascent module and the orbiter, with the focuses on the multi impulse orbit scheme selection, nominal orbit optimization, orbit control strategy and error analysis.Moreover, the actual flight data of Chang’e 5 mission is provided to verify the correctness of the designs.

Key words: Lunar orbit, Rendezvous and docking, Phasing orbit design, Chang’e 5