The temporomandibular joint is located in front of the bilateral ear screens, commonly known as the “hook”, and is the only bilaterally linked joint in the human body. Temporomandibular joint disorder is a common and frequent disease in dentistry. The symptoms of this disease include popping, pain, difficulty in opening and closing the mouth, and dislocation of the joint due to excessive opening of the mouth, and even headache, tinnitus, neck and shoulder pain. TMJ disorders are generally divided into four categories: masticatory muscle disorders, intra-articular structural disorders, inflammatory diseases and organic joint lesions. Among them, masticatory muscle disorders (mainly spasm, hyperactivity and myositis of maxillofacial and cervical muscles, etc.) and inflammatory diseases (synovitis, bursitis, etc.) can be treated by non-invasive therapies such as physical therapy, heat application, oral anti-inflammatory drugs and dental pads. The most common type of disorder is misalignment of the intra-articular structures (e.g. joint disc displacement, joint capsule dilatation leading to joint subluxation, etc.), and the common joint popping and difficulty in opening the mouth are mostly caused by joint disc displacement. Organic joint lesions (such as osteoarthrosis and perforation of the joint disc) are the most serious type of the disease, because the long-lasting lesions lead to bone destruction or hyperplasia, as well as destruction of the joint disc, which can be treated conservatively to relieve symptoms, but if the symptoms cannot be relieved after treatment, surgery is necessary. Intra-articular lesions over time tend to have joint adhesions that cause difficulty in opening the mouth, which can be treated conservatively, but severe cases require arthroscopic surgery or even open surgery. The authors have carried out scientific promotion of the disease in the hospital hospital newspaper, medical and health newspaper and the Health Times and other newspapers in and outside the province. In addition to TMJ disorders, joint injuries (including simple soft tissue injuries and condylar fractures) are also common in the temporomandibular joint. Soft tissue injuries often have traumatic joint inflammation, and severe lesions can form joint adhesions, which can be treated by joint braking, joint cavity injection therapy, and arthroscopic surgery (in cases of severe inflammation leading to joint adhesions). The treatment of condylar fractures depends on the specific situation of the fracture. Generally, if early surgery is possible, early functional exercise can be performed to restore function as soon as possible, and surgery must achieve adequate anatomical repositioning of the joint soft and hard tissues, while conservative treatment is advocated for pediatric patients. The absolute indications for surgery are increasing difficulty in opening the mouth and a tendency to form joint ankylosis. Temporomandibular joint ankylosis is usually caused by trauma or infection and manifests as a marked restriction of mouth opening or complete inability to open the mouth, which may be accompanied by small jaw or deviated jaw deformity. Among them, joint ankylosis caused by trauma is on the rise year by year. Since 2005, our department has adopted a modified surgical method of preserving the articular disc and condyle to treat traumatic joint ankylosis, which has not only achieved good surgical results, but also improved the facial shape and dental relationship. At present, this surgical method has a good prospect of application – less traumatic surgery, good effect, and can avoid the disadvantages brought by the traditional surgical method (aggravation of small mandibular deformity and disorder of dental relationship: anterior teeth open). Other joint diseases include condylar hypertrophy or hyperplasia, which often cause oblique deformity of the lower jaw and can be surgically removed to improve the facial shape and prevent further hyperplasia of the condyles; idiopathic condylar resorption, which often causes small mandibular deformity or anterior open dentition, affecting facial shape and masticatory function, can be corrected by orthognathic surgery or rib cartilage graft reconstruction if necessary. Tumors or cysts in the temporomandibular joint area are less common, most of them are benign tumors, chondrosarcoma is the most common and can be removed by open surgery; synovial chondrosarcoma can be removed by arthroscopic surgery.