Our purpose of this research is a development of the method that detects EEG of an athlete under exercising. If EEG under exercising can be measured, we can assess the mental condition of the athlete. Usually, EEG is measured in the shield room, and a subject is required rest in bed while measurement. And it is said that measuring EEG under exercising is difficult. In this paper, we will discus about our new measuring method that can detect EEG under exercising by using independent component analysis. Five normal subjects were tested with our method, and EEG without artifact was able to measured. So, we think our new method will be useful for the research of mental condition of the athlete