Abstract: The electrophysiological research of individual differences of intelligence has developed greatly in recent years. This article includes the application of EEG and ERP electrophysiological techniques in research of individual differences of intelligence and the new development of this field, which is the negative correlation between intelligence and brain activation can be influenced by task difficulties, the content of task and sex of subjects. Furthermore, this article discusses the problems in the previous electrophysiological research of individual differences of intelligence, such as the task in ERP research is too simple to reflect actual intelligence activities. At last, this article points the more and more obvious trend of using multi-electrophysiological techniques for the research of individual differences of intelligence

Key words: individual differences of intelligence, EEG, ERP, Neural efficiency hypothesis