Driving when tired is one of the main reasons that accidents happen. So far, many preventive measures have been taken. However, the effect is not satisfying. Accidents result from tired driving still happen from time to time. By observing and analyzing the work process of drivers, this paper proposes a fatigue detecting scheme of drivers based on Electroencephalograph(EEG). Using ThinkGear brain-wave receiver to monitor the EEG of drivers. Afterwords, the host computer receives EEG data through Bluetooth, which also completes the task of parsing and filtering data. Besides, an measurement criteria of fatigue is presented.