After various cooking treatments (washing, boiling, frying, baking etc.) of food samples, which had been prepared by dipping Chinese cabbage, potato, green peas and carrot in solutions containing 12 kinds of pesticides, the remaining pesticides were determined and the results were compared with those in filter paper samples reported previously. In most samples, the remaining percentage in food samples was less than that in paper samples. The correlation of behaviors of the pesticides between both samples was tested with respect to each pesticide or treatment. Among pesticides, 13 pairs in all of 23 pairs were estimated to be correlated significantly, and among treatments, the values after washing with water, washing with detergent and boiling, were found to be significantly correlated. As a screening test to consider the behavior of pesticides in foods during cooking treatments, filter paper might be applicable as food substitute in certain pesticides or treatments.