Ultrasound gastroscopy is firstly used to examine bulging lesions of the gastrointestinal and esophageal tracts, such as mesenchymal tumors and smooth muscle tumors from the base, cysts from the submucosa, ectopic pancreas, and cancer or polyps from the mucosa. Secondly, it can also be applied to diseases of the biliopancreatic system, such as stones of the lower bile duct, cancer of the lower bile duct, various tumors of the pancreas such as islet cell tumors and pancreatic cancer, as well as adenomas of the duodenal papilla and duodenal papillary cancer, which can be diagnosed by ultrasound gastroscopy. Some lesions that cannot be diagnosed can be biopsied by ultrasound gastroscopy to confirm the diagnosis. There are also some tumors or recurrent lymph nodes that recur after multiple treatments, such as surgery or ablation, such as tumors in the caudate lobe of the liver, retroperitoneal lymph nodes and tumors in the hilar region, which can be treated with ultrasound gastroscopy-guided ablation. For patients with advanced cancer, for example, advanced pancreatic cancer will invade the retroperitoneal nerve and the patient will have persistent and persistent pain. At this time, ultrasound gastroscopy or ultrasound can be used to guide the ablation of the abdominal ganglion, which can relieve the patient’s pain. In addition, there is also ultrasound gastroscopy or ultrasound-guided drainage of pancreatic pseudocysts.