This paper describes an on-going research to develop a Brain-Computer Interface (BCI) with which to conduct biofeedback training. A convenient portable wireless two-channel tiny Electroencephalogram (EEG) acquisition device has been developed for this study, which is based on Radio Frequency (RF) technology, and we developed a computer assisted EEG biofeedback system using Virtual Reality which provides an ideal medium to represent the spatial and temporal environment of electrical activity emanating from the brain. A system prototype system has been implemented with the proposed device for attention enhancement training with Virtual Reality (VR) environment, and 3 volunteers’ test results are reported in this paper. With the proposed system, lots of EEG biofeedback training can be designed easily and done at home in our daily life conveniently.