A cephalometric study of Class III Skeletal patient treated by BSSO mandibular setback and malar augmentation was undertaken to assess the results of treatment and to evaluate the soft tissue changes. It was concluded that: (i) the orthognathic profiles achieved were brought about by a combination of mandibular setback and malar augmentation (ii) a strong correlation in the horizontal direction occurred between all the selected landmarks of the lower lip and chin the ratios of soft tissue to corresponding hard tissue movements in lower lip and chin approached 1:1; (iii) in the vertical direction, a strong correlation occurred in the lower lip and chin. The most reliable horizontal and vertical soft tissue changes are tabulated for application in BSSO mandibular setback and malar augmentation for the Class III patient.