Patient female, 20 years old. Complaint: Protruding teeth requiring orthodontic treatment. Present medical history: post-replacement teeth protrusion, underdeveloped jaw, lip outward, self-consciousness affects the aesthetics, so she came to our hospital Past history: previous physical health, denied specific systemic diseases and drug allergy. X-ray examination: bony class II; high angle; lower anterior teeth lip tilt; upper and lower lips located in front of the E line Diagnosis: bony class II; maxillary protrusion, mandibular recession, underdeveloped chin, high angle; An’s class II, severe crowding of upper teeth, moderate crowding of lower teeth Treatment design: 1, combined orthodontic and orthognathic treatment. 2.Labial muscle training Effect evaluation: significant improvement in lateral shape, ideal tooth alignment and occlusal relationship. Before treatment: During treatment: After treatment.