Visual evoked potential (VEP) is widely used for diagnosis and analysis of the brain function on visual system. Accuracy of the analysis depends on the quality of VEP record, so the medical doctors and/or medical technologists always pay attention to the recording state during the recording. In this study, the real-time evaluation system for VEP recording was newly developed. The system can show the following information in real-time; characteristic parameters of VEP, contaminated artifacts affecting VEP recording and background EEG activity. Characteristic parameters of VEP are also possible to compare with their past tendency obtained from data base. Blink artifacts, EMG artifacts and posterior alpha wave were detected for evaluating the state of recording. Developed system was applied to VEP recording of 10 healthy adults. Effectiveness of the proposed system was investigated.