Enhanced CT is a common clinical examination method, which can only generally assist doctors to determine whether a tumor is benign or malignant. Doctors need to differentiate various diseases according to their own skill level and experience to improve the diagnostic accuracy. However, to determine whether a tumor is benign or malignant, pathological cytological examination should be used to make a definite diagnosis. Therefore, enhanced CT generally cannot be used as the basis for definite judgment of benign and malignant tumors. Generally, when patients undergo ordinary CT examination, only the location of suspicious lesions can be found, but not definitively. In order to allow doctors to compare more intuitively, enhanced CT should be used for further diagnosis of suspicious lesions. Enhanced CT can clearly observe the relationship between tumor and surrounding tissues through images, especially the relationship between tumor and blood vessels, and can also dynamically observe the changes of local lesions, so it can initially determine whether the tumor is benign or malignant, and can be used as an auxiliary technique. However, it should be noted that since benign tumors can develop into malignant tumors, the presence of nodules in the images of benign tumors should be considered for malignancy. To clarify whether the tumor is benign or malignant, histopathological examination by puncture biopsy should be performed, i.e. a small piece of lesion tissue should be removed and observed under microscope or immunohistochemical staining examination should be performed after treatment by professional doctors, which can clearly diagnose benign and malignant tumors. In addition, it should be combined with the patient’s physical examination and clinical symptoms for comprehensive analysis to improve the accuracy of diagnosis. Some diseases, such as bronchiectasis, can be diagnosed by ordinary CT of the chest, but tumor diseases, which are complex, require doctors to combine clinical experience, symptoms, and examination results to screen multiple diseases for a clear diagnosis, and patients are advised to understand and support the work of doctors for better treatment.