The examination of gastrointestinal diseases is mainly performed by barium contrast, whose value is comparable to that of endoscopy. usg and CT are of special significance for understanding the internal structure of gastrointestinal tumors, the degree of infiltration of the gastrointestinal wall and metastasis. The combined application of these methods can provide a strong basis for the classification of the stage of gastrointestinal tumors and the determination of the treatment plan. It can provide a strong basis. Angiography is used for the examination and intervention of gastrointestinal vascular diseases, gastrointestinal bleeding, and also has some value in the diagnosis of small intestinal tumors. MRI has less value in the diagnosis of gastrointestinal diseases. The identification of gastric sinus stenosis is a practical problem frequently encountered in radiological work. It is a more common X-ray sign. When a sinus stenosis is found, attention should first be paid to identifying whether it is caused by an extragastric or intragastric lesion. Extragastric lesions are mostly eccentric and can vary depending on the position and filling situation. The degree of deformation can be very serious, but the mucosal pattern is still normal, and the two are not proportional, and the angle of intersection of the indentation or filling defect with the gastric wall is mostly obtuse. In contrast, those due to lesions in the stomach itself are more centripetal, with a more fixed morphology, preceded by mucosal changes and consistent with the extent of stenosis in the sinus, with a smaller, acute angle of intersection between the filling defect and the gastric wall. The differentiation of benign and malignant stenoses is then considered. In general, the extent of malignant stenosis is more limited. It basically corresponds to the degree of stenosis. The mucosa is destroyed and lost, with irregular polyp-like filling defects; the gastric wall is stiff and fixed; the entrance to the stenotic segment is large, flared or funnel-shaped; the segment above the stenosis is dilated and clearly demarcated, and there may be a “shoulder sign” or “sleeve sign”. The base of the duodenal bulb may show asymmetric indentation. In contrast, benign stenosis is mostly centripetal and relatively extensive, with thickened mucosa and occasionally smooth nodular translucent areas without mucosal destruction, with normal contraction but poor dilation; the entrance is small, and the proximal end may be “round shoulder” or “straight”. The base of the duodenal bulb occasionally has pressure marks, but both sides are symmetrical, and there may be gastric mucosal prolapse. The first is to improve dietary habits, eat more fresh fruits, vegetables and coarse fiber food, and eat less high-fat food. Second, we should actively prevent and control intestinal diseases and strengthen exercise.