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In order to make it possible for the brain - computer interface (BCI) to get rid of the PC, so establishing practical and pragmatic products, as well as a portable processing platform has become a vital study. This system adopts field-programmable gate array (FPGA) to control VGA monitor and design a multi-purpose visual evoked stimulator, thus the system can produce a variety of combinations of real-time online mode stimulation signals to induce steady-state visual evoked potential of people. When the signal was collected into a digital signal processor (DSP), the FIR and FFT will process this signal so as to obtain a higher recognizable of the visual evoked potential signals. Then the data will be transmitted by radio to the processor STM32 and display on the LCD touch screen at the real time. This system acquires, processes and displays EEG at the real-time, thus it achieved the portable pattern from the stimulator, acquisition and processing platform to display. Besides, it is available to be transplanted into other miniature devices. 