Abstract: Trajectory design is an important part of research on crewed asteroid exploration.Firstly, combined with the basic condition and postulate of trajectory design,the trajectory model was built based on the Lambert theory.The validity of the model was verified through computer simulation. The trajectory model was used for the crewed exploration to asteroid 89136, and the trajectory design results were given.Secondly,different failure modes were considered,the abort trajectory and the characteristics were analyzed, and the ability of the explorer to return to the earth in an emergency was discussed.Finally, the related conclusions were drawn.

Key words: Crewed exploration, Asteroid, Trajectory design, Lambert problem, Abort trajectory