Abstract: This paper reports on the clinical treatment of 55 patients with Sarcocystis suihominis, diagnosed by finding sporocysts or oocysts from their feces. The main clinical symptoms were abdomianl pain, diarrhoea, anaemia and eosinophilia, etc. The patients were divided into three groups and were given sulfadiazine (20 cases), co-sulfaisomezole(16 cases) and pyquiton(19 cases) respectively. After one month, the feces of the patients were re-examined, the negative rate being 75.0%, 81.2% and 77.8% respectively. The patients' symptoms including abdominal pain and diarrhoea disappeared, and their general conditions improved.