Objective To study the MSCT findings of Extranodal Nasal-Type NK/T-cell Lymphoma(NKTCL), in order to improve level of diagnosis and differential diagnosis. Methods The MSCT data of 31 cases of NKTCL, proven clinically and pathologically were studied retrospectively. Results Of the 31 patients, 22 patients primary lesions were in nasal cavity, 9 patients showed localized type, the localized lesions were found in the anterior nasal cavity or nasal vestibule in 7 cases, and in posterior part in 2 cases, no obvious bone destruction. 13 patients showed localized diffuse type, the lesions to diffuse growth and widely existed nasal cavity, in volving middle and inferior turbinate, part patients invaded nasal vestibule, naslala, paranasal sinus and orbit, accompanying with variable bony destruction in the midline of nasal cavity. 2 patients primary lesions were in paranasal sinus, MSCT manifestation of heterogeneous soft tissue density mass and mildmoderate enhancement. 7 patients primary lesions were in Waldeyer's ring, 5 patients in palatal tonsil and 2 patients invaded multiple sites were homogeneous or heterogeneous soft tissue density mass and mild-moderate enhancement on MSCT. Conclusion The extranodal nasal-type NK/T-cell lymphoma has some characteristics imaging features of the position, shape, density and enhancement on MSCT, these information are helpful for the clinical early diagnosis and treatment.