Nasal CT can not completely exclude nasopharyngeal cancer, and the diagnosis of nasopharyngeal cancer needs to be confirmed by nasal endoscopy and pathologic examination of nasopharynx. Nasal CT can be used as the screening and preliminary diagnosis of nasopharyngeal cancer, which can clarify whether there is any lesion in nasopharyngeal area, if the lesion is very obvious, it can be used to determine the position of nasopharyngeal area, and then further do the localized pathological slice laboratory test to confirm the diagnosis of nasopharyngeal cancer. Most of the early nasopharyngeal cancer patients have not shown clinical symptoms yet, and nasopharyngeal tumors are relatively hidden, so nasopharyngeal ct can not even find any abnormality at all. Therefore, clinics usually use nasopharyngeal ct, nasopharyngoscopy, MRI, nasal endoscopy and tumor markers to comprehensively check whether the patient has nasopharyngeal cancer or not. It is suggested that patients should improve the relevant examinations and cooperate with the treatment actively after the diagnosis is clear, so as to avoid delaying the condition.