Mandibular joint dysfunction, i.e. temporomandibular joint disorder, may be caused by hyperfunction of extrapterygoid muscle, inflammation of synovial membrane or joint capsule, etc. The treatment includes extrapterygoid muscle closure and joint closure therapy. 1. Hyperfunction of extrapterygoid muscle: use 0.5% or 1% lidocaine 5ml for extrapterygoid muscle closure, once a day, 5 times as a course of treatment. The dosage of lidocaine and the interval of closure can be adjusted according to clinical symptoms. 2. Inflammation of synovial membrane or joint capsule: adopt joint closure treatment, use prednisolone suspension to add 2% lidocaine to be injected into the upper cavity of the joint. All of the above medication should be carried out under the guidance of a doctor, temporomandibular joint disorders may have other causes, it is recommended to go to the hospital in a timely manner, clear causes for targeted treatment.