Objective To analyze clinical value of CT and MRI in the diagnosis of fungal sinusitis. Methods A retrospective analysis from June 6, 2011-May 2015 in our hospital conducted by pathology for the clinical data of 32 cases with fungal sinusitis. All patients were examined by CT and MRI after admission. The authors summarized their imaging characteristics and analyzed the CT and MRI in the diagnosis of fungal sinusitis. Results CT: 32 cases of maxillary sinus disease in 16 cases, 9 cases on the right side, 7 cases on the left side, 9 cases of sphenoid sinus involvement, and 7 cases of ethmoid sinus. Uneven density of soft tissue were visible in the sinus cavity, soft tissue window showed irregular calcifications in sinus cavity, the affected sinus wall displayed bone hyperplasia and sclerosis, the paranasal sinus boundary was clear. MRI: Compared with brain parenchymal, 7 cases of T1WI showed low signal intensity, 21 cases showed equal signals, while 4 cases showed small amount of low signals. Lesions with the priority of low signals, together with few high signals of different forms and amount on T2WI, the affected sinus had obstructive inflammation that showed high signal on T2WI , while the T1WI sequence had equal signals with the obvious peripheral enhancement. Lesions could be invasive to orbit, cavernous sinus, brain parenchyma, infratetemporal fossa and pterygopalatine fossa, and the nasopharyngeal soft tissue had been thickened obviously together with the destruction of hard palate. Conclusion In the diagnosis of fungal sinusitis, the successful rate from CT for calcifications checking is higher. It can be used as the preferred examination method, and the advantage of magnetic resonance imaging (MRI) in the sinus cavity involvement is even better.