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We present a calculating entropy and an accumulating energy electroencephalography (EEG) analyses method for the purpose of supporting the clinical brain death determination.The brain death is defined as the cessation and irreversibility of all brain and brain stem functions.Based on this definition, the basic clinical criterion has been established in most countries.However, in the standard process of brain death diagnosis it often involves certain risks and takes a long time.Therefore, in order to reduce the risk and to save the precious time for the medical care in clinical practice, an EEG-based preliminary examination system was developed during the standard clinical procedure.The purpose of the preliminary EEG examination is to explore advanced signal processing tools to discover whether any brain wave activity occurs in the patients brain.The EEG preliminary examination system includes a portable EEG data acquisition tool and the EEG-oriented signal processing tools.The signal processing tools include several routines of noise reduction, source separation, feature extraction, as well as statistical tests.