The soft tissue of the submandibular gland usually refers primarily to the mixtures of glands in the mandible. The submandibular gland is medically known as the submandibular gland, as a secretory gland, its secretion of saliva can be involved in the wetting of the oral cavity, but also involved in food intake and swallowing, and it is usually a mixture of glands, but the plasma vesicles are dominant, so the submandibular gland is one of the most important glands in the human body, which is located under the lower part of the mandible and the floor of the mouth, that is, the submandibular triangle surrounded by the bicuspid muscle anterior and posterior abdominal area. At the same time, the submandibular gland is also a gland prone to disease because of its low position and high opening, so chronic submandibulitis often occurs due to submandibular ductal calculi.