Inclusion Criteria:  Males or females who are over 18 years old (inclusive); Enteroscopy and related examinations are needed to further clarify the characteristics of digestive tract diseases; Able to read, understand and sign the informed consent form; The researcher believes that the subject can understand the process of the clinical research, is willing and able to complete all the research procedures and follow-up visits, and cooperate with the research procedures.  Exclusion Criteria:  Participated in other clinical trials, signed an informed consent form and within the follow-up period of other clinical trials; Abuse of drugs or alcohol or mental disorders in the last 5 years; Women during pregnancy or breastfeeding; Subjects with previous history of bowel surgery; The investigator believes that the subject is not suitable for enteroscopy and related examinations; The investigator believes that the subject is not suitable for high-risk diseases or other special circumstances to participate in clinical trials. Patients with gastrointestinal bleeding; Known or highly suspected allergy to any ingredient of bowel cleansing agent; Restricted activities or any mental or physical condition impairs their ability to drink intestinal cleansing preparations; Known or suspected intestinal obstruction or perforation, toxic megacolon, most colectomy, heart failure (grade III or IV), severe cardiovascular disease, severe liver failure or end, renal insufficiency, etc.