I. Clinical symptoms: 1. Simple type accounts for the majority. Cysts are located in the sublingual area, light purple-blue color, soft and fluctuating sensation when touched. Often located in the bottom side of the mouth. Larger cysts can lift the tongue, resembling a “heavy tongue”. After rupture of the cyst due to trauma, a viscous and slightly yellow or egg-white fluid flows out, and the cyst temporarily disappears. After a few days, the wound heals and the cyst grows as before. 2. Extraoral type is also known as latent type. The main manifestation is the swelling in the submandibular region, while the cyst in the floor of the mouth is not obvious. It is soft to palpation, not adherent to the skin, and not compressible. 3.Dumbbell type is a mixture of the above two types, i.e., cystic swelling can be seen in both intraoral sublingual area and extraoral mandibular area. Differential diagnosis should be differentiated from hemangioma of the floor of the mouth, lymphangioma, dermoid cyst, mainly relying on puncture content examination, sublingual gland cysts can be extracted with viscous fluid. Second, the treatment 1, if only a very small one or two, even if it is not treated, it has a certain self-healing ability, but the self-healing ability is poor, 2, if the symptoms of the sublingual gland cysts have not disappeared, you can only take a reasonable treatment method. The radical treatment is to remove the sublingual gland, leaving part of the cyst wall without causing recurrence. For patients and infants whose general condition cannot tolerate sublingual gland excision, simple pouch suture can be done, and sublingual gland excision can be performed when the general condition improves or when the infant grows up to 4-7 years old. Third, postoperative care: A, let the patient lie flat or semi-recumbent position, head tilted to one side, give vitamin C, compound vitamin B and antimicrobials. B, Pay attention to the observation of wound bleeding and edema. C.Keep the respiratory tract open, remove intraoral secretions in time, and pay attention to observing the edema of the tongue and the floor of the mouth. D. Feed full-fluid food within 1 week after surgery, and then change to semi-fluid food. E. Restrict the patient’s speech for 3-5 days after surgery, and reduce tongue activity. F. Oral care twice a day. Mouthwash should be given. G, postoperative general secondary care, in ketamine anesthesia under surgery, postoperative care according to general anesthesia.