Allergic rhinitis, or allergic rhinitis, is a non-infectious inflammatory disease of the nasal mucosa in which exposure to allergens in atopic individuals is followed by the release of mediators (mainly histamine) mediated mainly by IgE, with the involvement of a variety of immunoreactive cells and cytokines, etc. The symptoms are mainly paroxysmal sneezing, clear nasal discharge, nasal congestion and nasal itching. Some of them are accompanied by hyposmia. 1, Sneezing several times a day in paroxysmal attacks, more than 3 each time, mostly in the morning or at night or immediately after contact with allergens. 2. Clear nasal discharge with a large amount of clear watery nasal discharge, sometimes unconsciously dripping down from the nostrils. 3.Intermittent or continuous nasal congestion, unilateral or bilateral, with different degrees of severity. 4, Nasal itch most patients itch in the nose, hay fever patients may be accompanied by itchy eyes, itchy ears and itchy throat. The pterygopalatine ganglion system belongs to the 2nd branch (maxillary branch) of the trigeminal nerve, which is a sensory nerve. When this nerve passes through the maxillary recess of the pterygoid process, it sends down two pterygopalatine nerves, which merge in the pterygopalatine fossa to form an enlarged, nodular pterygopalatine ganglion, and sends many postganglionic branches forward, backward and downward to the nose, mouth and the roof of the pharynx. Although the pterygopalatine ganglion is mainly innervated by sensory nerves, some sympathetic and parasympathetic fibers of the pterygopalatine nerve are also involved, and the postganglionic fibers of this nerve are distributed to the superior, middle and inferior turbinates, as well as the nasal septum and the roof of the nasopharynx. The sympathetic nerve has the function of causing vasoconstriction, thus reducing the blood flow in the nasal mucosa and cavernous body and decreasing glandular secretions. The parasympathetic nerve, on the other hand, has the function of vasodilatation, which causes excessive congestion in the cavernous body, expansion of the nasal mucosa, and a large increase in glandular secretions. Therefore, the pterygopalatine ganglion is innervated by both sympathetic and parasympathetic nerve fibers, and must have the exact opposite effects of these two nerve fibers at the same time. In a healthy state, they regulate each other at all times to maintain the balance between them, which is explained by the theory of Chinese medicine, that is, the role of Yin and Yang balance. Yin and yang can be mutually exclusive, which perfectly matches the function of sympathetic and parasympathetic nerves. The pterygopalatine ganglion regulation is very effective for patients with nasal diseases: 90% for chronic rhinitis, 70.4% for allergic rhinitis, and 52.4% for chronic purulent sinusitis.