The general treatment procedure for dentofacial is completed by pre-operative orthodontics, orthognathic surgery, and post-operative orthodontics treatment, in such order.Even though this conventional procedure shows relatively satisfactory results, it has critical drawbacks that the facial profile worsens during the pre-operative orthodontics and the period of total orthodontic treatment is too long.This is a book that introduces so-called surgery first orthodontic treatment, in which the operator calculates the amount that will be corrected by pre-operative orthodontics and sets up the treatment plan including post-operative orthodontics.Based on the treatment experience until now, we included the cases which this new treatment method exactly resulted in what conventional treatment would have done. Even In case which surgery first orthodonthic approach seem difficult, in future it could be applicable depends on our efforts. It has come to an idea that this method is a better physiological treatment than the conventional one. Above all things, we tried to reduce patients inconvenience by minimizing the period of pre-operative orthodontics on cases which surgery first orthodonthic approach seem difficult. This book presents all research data about the surgery first orthodonthic approach and explains the concept, the method, and the real cases of the surgery first orthodonthic approach. So we hope this book would be helpful to the orthodontists and maxillofacial plastic surgeons that are interest in this method.