Abstract: It is necessary to use multi-point forces to unload the gravity for the space camera during the assembling and aligning process. A general space camera features a large size and a low stiffness, and its simulation optimization is very complicated. Thus, an optimization method of gravity unloading simulation based on the greedy algorithm and the beetle antenna search is desirable. This method extracts a set of feasible unloading points of the system, one point at a time. Then the numbers of unloading points will gradually increase until the differences between the ground and in-orbit results are within the allowable range of the system error. The optimal unloading forces of each unloading point system are calculated by the beetle antenna search algorithm, and then the best system values can be obtained. By using the optimization method of the gravity unloading simulation based on the greedy algorithm and the beetle antenna search algorithm, the iterative optimization calculations are automatically carried out in the computer, so that the perfect unloading point system and the best unloading forces can be obtained efficiently and accurately.