Allergic rhinitis with yellow nasal snot indicates sinusitis caused by bacterial infection, which can be initially determined through nasal endoscopy and sinus CT examination. The main reason is that allergic rhinitis can cause edema in the mucous membrane of the nasal cavity and obstruct the normal sinus drainage opening, so that the secretions in the sinus cavity cannot flow out, and after a long time, the internal bacteria breed. In addition to allergic rhinitis medications, such as anti-allergic drugs and glucocorticoid nasal sprays, sensitive antibiotics, such as penicillins and cephalosporins, should be used for treatment. Combine with short-term nasal vasoconstrictors as well as mucus promoters to achieve nasal aeration and drainage, so that the nasal space can be expanded and pus can flow out smoothly. Combined with saline rinsing of the nasal cavity, it facilitates the flow of secretions and also promotes the recovery of mucosal function. For patients who have poor results with medication, surgery should be chosen and regular follow-up and nasal medication must be given after surgery in order to prevent recurrence.