A single dose of albendazole (candy) 100 mg and 100 mg qd for two days was given respectively to 135 and 321 children who were infected with Enterobius vermicularis. All cases were cured 3wk later according to perianal tape examination. The same drug of 150 mg qd and 200 mg qd for two days was administered respectively to residents with single or multi-infections of Ascaris, hookworm and Trichuris; the egg negative conversion rates of the two dosages were revealed to be 99.4% (466/469) and 99.8% (487/488) for Ascaris infection, 96.8% (91/94) and 94.3% (99/105) for hookworm infection, and 53.4% (228/427) and 76.3% (370/486) for Trichuris infection. The maximal numbers of worm expelled were 100 on d2-3, 88 on d3-5 and 588 on d2-4 for Enterobius, Ascaris and hookworm, respectively; whereas the discharged Trichuris were scarce, merely 4.3 in average. The results exhibited promising efficacy of the drug on Enterobius, Ascaris and hookworm infections, but not so on trichuriasis.