Abstract: Objective: To analyze the clinical symptoms and CT findings of fungous sinusitis， and to assess the value of CT in diagnosis of the disease. Methods: The clinical symptoms and CT features of 25 cases of fungous sinusitis which had been proved by pathology after operation were analyzed retrospectively. Results: The main clinical features of fungous sinusitis were nasal obstruction，headache，purulent nasal discharge，suction of blood mucus and olfactory abnormalities; CT scans showed inhomogeneous soft tissue density involving the unilateral or bilateral， single or multiple paranasal sinus cavities，and sinus cavity narrowing. Plaque， spotted and strip calcification were observed in the sinus cavity of 19 cases，and 13 cases were accompanied by enlarged maxillary sinus ostium and 4 cases bone absorption wall thinning in the maxillary sinus. Conclusions: The diagnosis of fungous sinusitis relies mainly on the clinical symptoms and CT examination. The lesion density， scope and paranasal sinus anatomic structure can be displayed clearly in CT scan. Abnormal calcification in the lesion is a reliable sign for the diagnosis of fungous sinusitis， and CT scan is the first and the most effective diagnostic method.