The aim of this study is to determine whether a set to a distracter enhances an inhibitation effect. This study confirmed this hypothesis by examination of inhibition effect under three condition: (1) the repeated ignored condition, where the ignored picture was in the same category as the next target and remained the same throughout the task, (2) ignored condition, where the ignored picture was in the same category as the next target, but the ignored picture varied in each trial, and (3) the comparative condition, where the ignored picture was not in the same category as the next target and varied in each trial. In Experiment 1, inhibition effect in repeated ignored condition was greater than ignored condition. In Experiment 2, interference in repeated ignored condition was lesser than ignored condition. These data suggests that a set to a distracter enhances the inhibitation effect and reduces the interference from the distracter.