Objective To investigate the role of CT and MRI in the diagnosis of fungal sinusitis. Methods The clinical data of 41 patients with pathologically confirmed fungal sinusitis from March 2011 to August, were retrospectively analyzed, including 25 males and 16 females, aged (53.9+5.4) years old. CT and MRI scans were performed in all patients, and the results were compared with pathologic findings. Results CT showed that the involved sinus mucosal thickening, sinus cavity density, soft tissue density filled sinus cavity, the lesions seen in the mean bubble residue, calcification, with part of the medial wall of the maxillary sinus bone respiratory damage, wall of bone hyperplasia and sclerosis; sinus cavity T1WI is low signal or signal on T1WI and T2WI showed heterogeneous low signal or mixed signal, around T1WI showed low signal on T1WI and T2WI showed high signal, the signal with sinus cavity and enhanced visible sinus mucosal thickening and central lesion without enhancement. Conclusion CT scan of mycotic rhinitis lesion calcification, as the preferred screening method, MRI can show the lesion involving the characteristics and the nearby tissue structure and the CT cannot be diagnosed fungal sinusitis patients with MRI screening, in order to improve the diagnostic accuracy rate of the.