The chin plays an important role in aesthetic harmony, especially in the lower third of the face, its prominence and vertical length have a great impact on the profile of the face. Bone genioplasty is a functional surgery that provides the possibility of correcting chin defects in three horizontals, vertical and transverse levels by sliding, jumping, reduction and centralizing methods. Today, a V-shaped elongated chin is very desirable. The final result of the surgeries is always accompanied by a step that creates an additional angle in the jaw and overshadows the V-shaped chin surgery and makes the patient look older. In the present work, a new modified method based on inferior mandibular border osteotomy reduction of distal bone is presented, based on which the step created in the old methods is replaced with a gentle angle. For this purpose, a comparison has been made between the old reduction method and the modified method performed on two female patients. In both cases, X-ray radiography, photo slides and general examination of the patient, was utilized for discussion and investigation. The results showed well that the applied method can provide a perfect and very compliant surgery without creating an additional step and angle. In the corrected state, the absence of the angle made the patient's age appear as her own.