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Electroencephalogram (EEG) has been generally known as a non-destructive method to examine the function of human brain. In recent years, brain-computer interface (BCI) based on EEG has been a growing field of research and development. This work presents to identify time frequency components of movement-related cortical potential (MRCP) associated with the human voluntary muscle behaviors using the wavelet transform. The EEG was recorded with the 5-channel referential derivations, Fz, Cz, C3, C4, Pz, referenced to the right earlobe based on the international 10-20 system. The voluntary activity was recorded with the electrode placed on the palm side of the metacarpophalangeal joint when the subjects flexed the right - or left - hand index finger respectively and eyes closed. The synchronous time-frequency components of MRCP were shown in this study.