The ulcer stomach model is a biological teaching tool used to demonstrate the internal structure and pathological characteristics of the stomach during ulcer lesions. This model simulates the shape of the real stomach and displays the location and shape of ulcers on the stomach wall. In biology teaching, the ulcer stomach model can help students intuitively understand the pathological changes of gastric ulcers, learn the impact of ulcers on gastric wall tissue, and the possible complications that ulcers may cause, such as bleeding, perforation, etc. By observing the model, students can master the anatomical structure and function of the stomach, understand the causes, symptoms, and treatment methods of gastric ulcers.