Korea Parasite Eradication Association alleged in its seasonal report spring/1975 that 36.8 percent of primary, middle and high school students in Seoul area are infected with parasites. For the purpose of a comparative study between the high rate of parasite infection among Korean students and that of parasite eggs attached to vegetables which perform intermediary role in carrying the eggs to human body, such vegetables as lettuce, Korean cabbage, young radish, green onion, cabbage which are on sale at several markets in Seoul city are sampled at random for study. The infection rate of parasitic eggs and larvae on vegetables is studied twice while the detaching mean while removing rate of eggs and larvae in proportion to the number of washing them is studied three times. Every 300 grams of vegetables is taken at random for examination and every one of them is washed with a hard brush and then the kinds of parasite eggs and the ratio of eggs attached to them are studied. The results are as follows: 1) The rate of infected vegetables with parasitic eggs and larvae according to the kinds of vegetables is young radish 29.3%, Korean cabbage 26.3% Green onion 22.5%, lettuce 14.1%, cabbage 7.8% 2) The rate of infection according to the kinds of parasites is Ascaridae 27.8%, Ancylostomatidae 10.6%, Taenia 5.7% Clonorchis 0.5%, Enterobius and Trichocephalus are detected only 0.2%, which is less than other parasites. 3) The variation of the infection rate on the examined materials according to seasonal weather condition, summer and autumn, is nearly the same summer 50.2% autumn 49.2% 4) The cletaching or removing rate of parasitic eggs and larvae according to the number of washing is 1st washing 68.1% 2nd washing 24.3% 3rd washing 7$cdot$6%