Gastric CT is not a substitute for gastroscopy. Both have their own advantages and disadvantages in diagnosing gastric diseases and can complement each other, but not replace each other. The stomach belongs to the cavity organs, CT scanning is very difficult to see clearly, even if the enhancement of CT scanning, but also from the stomach whether there is a mass, the relationship between the mass and the gastric wall, as well as around the stomach there is no lymph node enlargement, the three aspects to judge. CT scanning can not be like gastroscopy, can be visualized to observe the gastric cavity of the mucous membrane of the condition of the mass, the morphology of the ulcers, and to take a biopsy of the pathology of the treatment under the microscope, and so on. When gastric lesions are detected, it is best to combine the two examinations to complement each other’s strengths and weaknesses, so that a more comprehensive assessment of the condition can be made and a more accurate and optimized treatment plan can be formulated.