Patients with skeletal classⅢ can be successfully treated by either orthognathic surgery or orthodontic treatment owing to unavoidable circumstances. Sisters were treated, elder sister by orthognathic surgery and younger one by compromised treatment. For the ideal treatment goal, orthognathic surgery will be inevitable in skeletal problem case, but by the patient`s private situations orthodontist cannot help doing compromised treatment. It could be another option if correct biomechanical approach is used.