Generally speaking, chest radiography is the basis and first choice for chest imaging diagnosis, which allows dynamic understanding of the disease and detection of the disease evolution process through review. In terms of detecting lesions and localizing qualitative diagnosis, CT plain scan is its complementary examination, which can detect apical, subpleural and interstitial lung lesions and mediastinal lesions as early as possible, and is helpful for the diagnosis of lesions ≤2 cm in diameter. MRI plays a prominent role in pulmonary embolism and aneurysm entrapment. The above examination methods complement and combine with each other in the diagnosis of chest imaging, and their correct selection and use can help save medical resources and reduce the problem of “expensive medical care”.