Objective To investigate the effect of Kirschner and bandage fixation on the hallux valgus (HV) after distal osteotomy of the first metatarsus. Methods A comprehensive three-dimensional finite-element model of the foot was established based on medical images of the foot of a patient with HV, including bones, sesamoid, cartilage, ligaments, soft tissues, and Achilles tendon. The models of Kirschner and bandage fixation were also established to investigate the biomechanical behavior of the foot with HV during full weight-bearing standing. Results The compressive stress (14.9 MPa) between the osteotomy fragment surfaces in bandage fixation was higher than the peak stress of the Kirschner needle (6.71 MPa). The Kirschner fixation was better than the bandage fixation from the dorsal, plantar, medial, and lateral foot. Therefore, it was more favorable for the stability of the osteotomy. Conclusions The bandage fixation can reduce the healing time of osteotomy, providing an optimal design for fixation methods after hallux valgus operations.