Medical parasitology belongs to pathogenic biology and is one of the basic courses of preventive medicine and clinical medicine. It is a science that studies the biology, ecology, pathogenic mechanism, experimental diagnosis, epidemic law and prevention of human parasitic diseases. Parasitology must be from theory, from theory to practice, from parasites entering human or animals, establishing parasitic relationship, the development of parasitic diseases, the compression and control of parasitic diseases, to the termination and long-term consolidation of parasitic diseases.