The presence of parasites in the body is mainly detected through clinical diagnosis and experimental diagnosis, in which the clinical diagnosis mainly includes inquiring about the history, clinical manifestations and auxiliary examination, while the experimental diagnosis includes pathogenic examination, pathological examination, immunological examination and so on. 1. Clinical diagnosis (1) History inquiry: history inquiry is to know the patient’s detailed medical history, treatment history and infection history. (2) Clinical manifestations: Specialized physicians can speculate whether it is parasitic infection or not based on clinical symptoms and signs, and also what kind of parasitic infection it is. (3) Auxiliary examinations: such as CT, routine laboratory tests, ultrasound, X-ray, etc. 2. Laboratory diagnosis (1) Pathogenic examination: Pathogenic examination means that the parasites are detected in the blood, secretion and feces of the body of the examined person, which is an important basis for confirming the diagnosis of parasitic disease. (2) Pathologic examination: Pathologic examination is actually one of the means of pathogenic examination, which is to take clinical biopsy and pathological specimens for examination, such as liver puncture. (3) Immunological examination: Immunological examination is actually based on the immune response generated by the parasites invading the body to detect the parasites through antigen detection or antibody elimination. Once a person has been screened for the presence of parasites, he or she must cooperate with the doctor in treating the disease caused by the different parasites.