The method and scope of barium meal imaging and gastroscopy are different. Barium meal imaging is a non-invasive test, which requires only oral administration of barium meal and then observation of the flow of barium meal in the digestive system through X-ray to determine whether there is any disease in the digestive system. Gastroscopy is an invasive test, which requires the endoscope to enter the stomach through the esophagus and directly observe the color and shape of the gastric mucosa as well as the peristaltic function of the gastric body, which will cause some damage to the gastric mucosa during the examination. In addition to the upper gastrointestinal system, barium meal angiography also has diagnostic significance for lower gastrointestinal system diseases, but the scope of gastroscopy has certain limitations, mainly for the esophagus, stomach and duodenum, but not for lower gastrointestinal tract diseases. However, the scope of gastroscopy is limited, mainly for the esophagus, stomach and duodenum, but not for the lower gastrointestinal tract. Once suspicious lesions are detected through gastroscopy, biopsies can be extracted and the disease can be diagnosed.