In view of the structural lightweight requirement of slewing support mechanisms for aircrafts，the optimization design and additive manufacturing of slewing support mechanisms for aircrafts are studied，considering the process constraints.The structure is divided into design domains based on the part functions，the key load-bearing parts are topologically optimized，and the shell surfaces are parameterized.Then，the model for additive manufacturing is modified according to the overhang angles and size constraints.Finally，the modified model is verified by the finite element simulation.The results show that after additive manufacturing printing and post-processing，the optimized part achieves a 21.74% weight reduction，meeting the design requirement.