Materials and methods: 111 pediatrics patients under 16 year old with diagnosis of chronic sinusitis admitted to ENT National Hospital Departement Pediatric Ha Noi Viet Nam. Results: Clinical manifestation was characterized by: nasal obstruction (83.8 percent), rhinorrea (81.1 percent), sneeze (54.9 percent) and cough (65.8 percent). Allergy rhinitis and as before at the admition with antibiotics antihistaminics and local vasoconstrictors Treatment classically consists antibiotics. They should be given for a minimum of 3 weeks and are often necessary for 4 to 6 weeks. Intranasal steroids are also used. Early surgical intervention should be avoided if possible and surgery only undertaken when clinically necessary. Conclution: Sinusitis in children is different than sinusitis in adults. Children more often demonstrate a cough, bad breath, crankiness, low energy, and swelling around the eyes along with a thick yellow-green nasal or post-nasal drip. Once the diagnosis of sinusitis has been made, children are successfully treated with antibiotic therapy in most cases. If medical therapy fails, surgical therapy can be used as a safe and effective method of treating sinus disease in children.