Endoscopy is one of the most important methods for clinical diagnosis and treatment of digestive system diseases. It has the advantages of less pain, simple operation and shortened hospital stay after operation. 1 However, the complex structure of the endoscope contains many delicate and small components, making that the endoscope is not easy to clean. Besides, the frequent crossuse of digestive endoscopes between patients put more challenges and requirements to the disinfection of endoscope. 2 If the disinfection and sterilisation process is not strictly conducted and achieve complete sterilisation, it is easy to cause nosocomial infections and affect the medical quality and patients' safety. 3 In recent years, the incidence of nosocomial infections related to digestive