The visible light communication lighting system based on white light emitting diode(LED) has been widely studied. However, the performance of ordinary LED restricts the modulation bandwidth of visible light communication. In order to further improve the modulation bandwidth of LED, micro-size LED can be used. This paper briefly describes the methods to improve the modulation bandwidth of LED, and summarizes the progress in optimizing the performance of micro-size LED in visible light communication in recent years, and points out the research direction of micro-size LED in the future.