Objective To investigate the CT features of natural killer cell/T-cell lymphoma in nasal cavity and nasopharynx (NKTCL). Methods Retrospectively analyzed the clinical date and CT findings of 23 patients with natural killer cell/T-cell lymphoma in nasal cavity and nasopharynx by surgery and pathology. Results Nasal cavity was mainly involved in 21 patients, all cases were located in one nasal cavity, the localized lesions were found in the anterior nasal cavity in 11 patients and in posterior part in 4 cases and diffuse performance in 3 patients. CT showed mass density was uniform density of soft tissue density, enhanced light to moderate enhancement; Involvement of nasal septum was detected in 11 patients and nasopharynx in 6 patients. The nasal cavity included paranasal sinuses in 13 patients and subcutaneous soft tissue of the face in 9 patients, bony destruction was demonstrated in 12 patients. Nasopharyngeal lesions in 5 cases, the performance of the nasopharyngeal wall and posterior wall of the uneven thickening of the soft tissue density, 2 cases of bubbles within the visible, the surface is not smooth, enhanced mild to moderate enhancement. Clearance in 3 cases, 2 cases of posterior nasal perforation. Conclusion Some CT features may suggest the diagnosis of natural killer cell/ T-cell lymphoma in nasal cavity and nasopharynx.