Advanced Upper Stage (AUS) is an important aircraft for future spaceflight. Based on AUS's thrust characteristic and assignment demand, the problem of AUS's quick orbit maneuver optimization is transformed to that of Minimum-time orbit maneuver using finite thrust. Firstly, a multi-restriction and minimum-time optimal model on impulse thrust is established, and the Improved Differential Evolution (IDE) algorithm is used to achieve global optimal solution. Secondly, a correct model on finite-thrust is built to modify the optimal solution by impulse thrust. Finally the solution of Minimum-time optimal orbit maneuver is obtained by finite-thrust. The simulation of quick orbital rendezvous has verified the reasonableness and correctness of the model and algorithm, the obtained terminal position error is 1.0 km magnitude and can be further corrected by terminal orbit adjustment.