Abstract: During March to Aprill 1990, a total of 1065 local residents in Lisu and Leme minority areas were surveyed by fecal examination with iodine direct smear, modified Kato-Katz thick smear, adhesive tape techniques and fecal culture. The overall infection rate of the two minorities was 93.1% and 97.6%, respectively. Multiple infection was very common ; cases infected more than 3 species accounted for 53.3% in Lisu and 61.4% in Leme. A total of 13 species of intestinal parasites were detected from the two minority areas, demonstrating the infection rates as follows: Ascaris lumbricoides 81.9%, hookworn (N. a. :A. d. =5.6:1) 69.3%, Trichuris trichiura 55.9%, Enterobius vermicularis 34.3%, Trichostrongylus orientalis 0.1%, Hymeno-lepis nana 0.1%, Entamoeba histolytica 0.8%, E. coli 8.2% E. hartmanni 3.2%, Endo-limax nana 8.6%, lodamoeba buetschlii 1.9%, Giardia lamblia 3.5%, and Blastocystis hominis 16.9%. The hookworm infection rate was higher in Lisu than that in Leme, while that of other nematode infections was generally higher in the latter minority This difference is attributed to the diversity of socioeconomic and hygienic conditions between the two minorities in recent years.