The appearance of gastric ulcers can be observed under gastroscopy, and some of the tissues of gastric ulcers can be kept under gastroscopy for slicing, and finally the diagnosis of malignant gastric ulcers can be confirmed by pathologic methods. The appearance of the gastric ulcer can be observed, if the edge is irregular and jagged, and the bottom of the stomach can appear nodular and uneven, it is likely to be malignant gastric ulcer, this method can only help to make a preliminary judgment, the final diagnosis requires pathology. Select a part of the tissue of the gastric ulcer to make a pathological section, observe the tissue under the microscope, and finally determine whether it is a malignant gastric ulcer, if once diagnosed as a gastric malignant gastric ulcer, it should be immediately performed surgical treatment.