The location of the lymph nodes of the angle of the mandible is in the mandibular space, the inner side of the lower edge of the right and left mandibular angle. 1. Mandibular lymph node is a more important part of the human body, generally distributed in the lower edge of the right and left mandibular angle medial, in front of the submandibular line by the parotid gland, under the about 1.5 ~ 3mm between, for the patient’s jaw area and the surrounding organs to play the role of immune transit. 2. Under normal circumstances, submandibular lymph nodes are not palpable. When there are infectious lesions in the mandibular face and neck, it will cause enlargement of submandibular lymph nodes, such as gingivitis, radiculitis, tonsillitis and so on. Therefore, patients should pay attention to diet and good living habits in daily life to ensure the healthy development of lymph. When the patient has the discomfort of submandibular lymph nodes, it is recommended that the patient go to the regular hospital in time, so as not to delay the condition.