Sinusitis in children is a common inflammatory disease of otorhinolaryngology, and its incidence is increasing every year. Sinusitis in children is unique. Children’s sinuses continue to develop after birth and complete maturation and gasification at different ages and stages, which makes the infection of sinusitis in children related to the age of the patients. Chronic sinusitis in children is a relatively common disease.In some cases, the symptoms are not obvious, so the diagnosis needs the help of imaging examination. If the sinusitis in children is not diagnosed and treated in time, it may cause serious orbital and intracranial complications.Patients will have irreversible blindness, double vision and other serious consequences. If detected and treated early, the prognosis of patients with the disease is generally good.In addition to clinical symptoms and experimental examination, the diagnosis of complications of sinusitis in children is often clarified by combining imaging examination, mainly including CT and MRI. CT can provide higher bone resolution, which is the first choice for diagnose orbital complications; MRI has better soft tissue resolution, which has good imaging effect for small parts. Strengthening imaging examination is of great clinical significance for the diagnosis and treatment of sinusitis in children, especially for the complications. Therefore, this review focuses on the CT and MRI studies of common types of sinusitis and its complications in children.