In this paper, 31 cases with lower jaw defects (disarticular of TMJ, 9; conservation of TMJ, 8; defects of mandibular arch, 14) were immediately reconstructed following tumor-surgery with plate, and combined with bone graft for some of cases. Results demonstrated the remarkable clinical value of this method in improving post-operation function and facial deformities, even though there exist problem such as healing, occlusion and loose of plate. In addition, the key technique procedures were discussed involving in operation.