Abstract:Abstract: Objective?To explore the role of gastrointestinal endoscope in the diagnosis and treatment of parasite infection in digestive tract.?Methods?A retrospective analysis of the records of patients diagnosed with parasite infection by gastrointestinal endoscopy from January 2004 to December 2018 was conducted. Parasite species was verified by reviewing records. Application of gastrointestinal endoscope in the treatment of parasite infection was evaluated.?Results?There were 614 patients found by endoscope to be with parasite infection during the 15 years. 60.0% of them (368 patients) were diagnosed by gastroendoscopy, while 39.4% of them (242 patients) were detected by colonoscopy. Other ways contributed to the discovery of parasite infection were enteroscopy and capsule endoscopy, each of them discovered 2 patients infected with parasites. Duodenum was the most common location of infection (356 cases), followed by cecum (185 cases). Digestive endoscopy could be employed to diagnose hookworm, whipworm, roundworm and pinworm infection, and could assist the diagnosis of schistosomiasis through biopsy of sigmoid colon to examine Schistosoma eggs. In terms of parasite species, only 49.0% were correctly diagnosed, while 47.7% were lack of exact diagnosis and 3.3% were misdiagnosed. The sensitivity of endoscopy in diagnosis of parasite infection was significantly higher than that of stool ova and parasites test. There were two ways for endoscope system to treat parasite infections, removing parasites by biopsy forceps and getting rid of them by perfusing anthelmintic drugs throughout small intestine in three times, both of which were turned out to be effective.?Conclusion?The definite species of some parasites may be determined by endoscopy according to its length, color and other observable characteristic. Patients with mild infection could be dewormed by endoscope system. Gastrointestinal endoscope might play a more positive role in the diagnosis and treatment of parasite infection.