In a computer cephalometric study open bite could be classified into five types, for which treatment plan is different. Clinically, about 15% cases need to extract premolar and 65% cases need molar extraction cases. When molar extracted, with reverse-curve heat active NiTi wires, treatment procedure is much simpler and treatment outcome is satisfactory. For difficult borderline cases, preadjusted appliance with micro-screw implant could get skeletal improvement which hardly be seen through traditional orthodontic treatment.