Inclusion Criteria:  From January 2014 to February 2021, patients with acute nonvariceal upper gastrointestinal bleeding underwent emergency endoscopic hemostasis in our hospital.  Exclusion Criteria:  1. The age is less than or equal to 18 years old and greater than or equal to 85 years old; 2. Forrest grade IIC and III; 3. Complicated with severe cardiovascular and cerebrovascular diseases or severe liver and kidney diseases (such as heart failure, liver failure, renal failure, etc.); 4. The records of the cases were incomplete.