1.No need for opening training within 1 week after surgery, eat liquid food and keep the mandible braked to facilitate wound recovery. 2.Opening training should be started on the seventh postoperative day (excluding the day of surgery). Opening training should be carried out gradually from small to large, including two aspects: active mouth opening and passive mouth opening. (1) Active mouth opening training: Patients can eat semi-liquid food or solid soft food, and the chewing movement in the process of eating is active mouth opening training. (2) Passive mouth opening training: The patient places the thumb on the same side as the affected side at the maxillary cuspid and the middle finger at the posterior area of the mandibular molar, pushing the mandible downward. Start with 5 minutes each time and gradually extend to 15 minutes, with light to heavy force, stop if pain occurs, 4 times a day (average distribution of training time, rest at least 3 hours after each training,eg one practice before going to bed, one practice in the morning, the remaining two average distribution of time). Both sides should be alternated. You can also practice with a spiral opener by placing the opener in the molar area and slowly opening it until there is no pain, maintaining this degree of opening, which should be increased by 1 mm every 2-3 days, starting with 5 minutes each time and gradually extending to 15 minutes, stopping if there is pain, 4 times a day. Both sides should be alternated. 3, efficacy judgment standard effective: the opening degree reaches 2cm in half a month after surgery, and more than 3cm in 1 month. The opening training time lasts for 6-12 months. Precautions: 1. To relieve pain and release muscle spasm, prepare hot water at about 50°C, put a towel into it, wring it out and apply it to the affected temporomandibular area for 15-20 min each time, 3 times a day. 2. When applying hot compresses, attention should be paid to the appropriate temperature, and the scope of hot compresses should not be limited to the local temporomandibular joint, but should also be applied to the subauricular region and the neck for hot compress treatment. Generally continue for about 3 months. 3. Passive opening training should be carried out alternately on both sides, and the strength, intensity and frequency of training should be gradual.