Ws507-2016 technical specification for cleaning and disinfection of flexible endoscopes requires that cleaning tanks and full-automatic cleaning and disinfection machines for different systems (such as respiratory tract and digestive tract) of flexible endoscopes should be set separately; endoscopic diagnosis and treatment of different systems should be carried out in different rooms. However, it is not emphasized that different parts (such as upper and lower digestive tract) of endoscopy must be cleaned separately, and diagnosis and treatment of different parts (such as upper and lower digestive tract) must be carried out in the same room.