Sinusitis in children is more common in outpatient clinics, and many parents are very nervous and worried about it. It is important to note that the guidelines are based on the principle of “easy to simplify, not easy to complicated, easy to coarse, not easy to fine” and are applicable to children under 14 years old. First of all, the main symptoms of rhinosinusitis are: nasal congestion, runny nose, cough, and headache. It is important to note that nasal congestion in children can be manifested as open-mouth whistling, coarse air or snoring in sleep at night. Specialized examination: congestion and hypertrophy of the turbinates, mucopurulent secretions in the nasal cavity and nasal passages can be seen. According to the urgency of the onset of the disease, it can be divided into two categories, one is acute rhinosinusitis, with nasal symptoms lasting more than 10 days and complete remission within 12 weeks. The second category is chronic rhinosinusitis, where nasal symptoms can last for more than 12 weeks and do not resolve completely. Endoscopic monitoring and CT scan of the sinuses at a specialist clinic can help with the diagnosis. Treatment: 1. Anti-inflammatory drug therapy, acute sinusitis: penicillins are preferred, such as amoxicillin clavulanate potassium. Or cephalosporin as well as macrolide antibiotics. And chronic sinusitis unless the secretion is purulent, generally do not use antimicrobial therapy. Because of the increase in drug-resistant bacteria in chronic rhinosinusitis, it is recommended to use appropriate antibiotics according to bacterial culture and drug sensitivity test results if needed. 2. Nasal glucocorticoids are recommended for 2-4 weeks for acute rhinosinusitis, and continue for two weeks after symptoms are controlled. For chronic rhinosinusitis, it is recommended to use for 8-12 weeks and continue for 2-4 weeks after the symptoms are controlled and evaluated. 3.Nasal rinses, either saline or 2.3% hypertonic saline can be used for nasal rinses. 4.Antihistamines 5.Mucus pro-discharge medication, such as eucalyptus citrulline capsules or Genoton capsules, with a course of at least two weeks. 6.Nasal decongestants can be used for a short period of time (less than 7 days) and in low concentrations in children with acute rhinosinusitis with persistent severe nasal congestion. It is recommended to use Serozoline or Hydroxyzoline. The use of nemetazoline is prohibited. Because children’s nasal cavity and sinuses are in the developmental stage, the mucosa in the post-surgical inflammatory reaction is heavy, the child is not easy to cooperate in the surgical cavity care, nasal stenosis is prone to age, for this reason, chronic rhinosinusitis in children is in principle not used post-surgical treatment, unless with 1. imaging nasal ventilation and drainage of adenoid hypertrophy and (or tonsillar hypertrophy) 2. nasal polyps and (or) maxillary sinus polyps causing obstruction to the sinus orifice nasal tract complex 3. the presence of intracranial, intraorbital, or periorbital complications. For the surgical treatment of sinusitis in children, the principles are small, delicate and minimally invasive. Frequent nasal endoscopy and surgical interventions after surgery are also not advisable. Regular postoperative follow-up with nasal irrigation and nasal glucocorticoid use should be continued for at least 12 weeks.