The earlier the age of mandibular protrusion, the better, and different orthodontic methods are suitable for different time periods. For example, cranial traction chin-pocket device is suitable for early skeletal anterior antomandibular combined with mandibular protrusion, which can be used at the late stage of milk teeth, replacement teeth or the early stage of permanent teeth. Anterior traction devices are indicated for early skeletal premaxilla combined with maxillary hypoplasia and mandibular protrusion, and can be used during replacement teeth or early permanent pressure. Functional appliances, such as the Activator and Frankel III appliances, are indicated for early skeletal anterior antimandibulars and functional anterior antimandibulars, and can be used during the periodontal period, especially during the late periodontal period. The Class III Retractor is also an orthodontic appliance, which is mainly used to adjust the intermandibular relationship in the proximal and middle when fixing orthodontic treatment, and is commonly used for early skeletal anterior antimandibulars, which can be used in the late replacement period and the early stage of permanent teeth. The removable maxillary maxillary cushion lingual reed appliance can be used for the treatment of any anterior antomandibular, alone, or in combination with other orthopedic appliances such as the chin pocket and other fixed orthopedic appliances. Fixed orthodontic appliances, including straight arch, square arch, and Begg appliances, can be used to correct anterior antomandibulars, mostly during the replacement and permanent dentition. In adults, mildly protruding mandibles can be corrected with non-plastic forces using the above orthodontic appliances, while overdevelopment of the mandible in combination with significant skeletal deformities requires combined orthodontic and surgical orthodontic treatment.