Endoscopic ultrasonography (EUS) is an advanced medical equipment that integrates ultrasound and endoscopy. It installs a miniature high-frequency ultrasound probe at the front end of the endoscope. When the endoscope enters the stomach cavity, the endoscope directly observes the shape of the cavity at the same time. Timely ultrasound scanning can be performed to obtain the histological features of each layer of the pipeline wall and ultrasound images of the surrounding organs.