Thirty-four cases out of 830 children with diarrhea were confirmed to be positive of fecal cryptosporidial oocysts with IFA technique and monoclonal antibodies in a period of 2 years. These 34 cases could be diagnosed as cryptosporidial enteritis. Their age ranged from 4 months to 7. 6 years with an average of 2. 5?1. 7 years. The stool was frothy and watery in appearance. High incidence occurred form June to September. Determination of PHA skin test, LBT and serum Ig was performed on 27 patients before, during and after the treatment of Astragalus membranaceus Bunge and Sophora flavescens Ait ( 2 traditional Chinese herb medicines). It was found that diarrhea lasted 10. 9?7. 1 days and oocyst shedding lasted 21. 5? 12. 3 days. Before treatment) PHA skin test showed an erythema of 7. 9?2. 4 mm in diameter, and LBT value was 48. 7%?10. 1% and they returned to normal after treatment.It is suggested that hot safrain-methylene blue stain and modified acid-fast stain of the stool be performed in those children with diarrhea of unknown etiology as a routine screening for cryptosporidial oocysts. The 2 Chinese herb medicines may have a repelling effect on the parasites and be. helpful to the cell immunity of the patients. Asymptomatic carriers of cry-tosporidial oocysts may be the source of infection.