The ratio of”Anterior Open Bite”cases is less than 5% in clinic,thus Orthodontists are out of practice onexperience and technique.In this report,we would like to compare one male and female patient,though theexamination diagnosis,undergone”None extraction-MEAW Technic”and”Extraction”toimprove the anterior openbite on account of different requirements and space.The report is based on the contrast between these twotreatments to reveal similarities and dissimilarities.(J.Taiwan Assoc.Orthod.14(3):26-38,2002)