The high-brightness GaN-based blue-light-emitting diodes impacts traditional illumination lamp-sources largely. This paper briefly introduces GaN material, the development on blue LED based on it with the technique enhancement and several approaches to improve the performance of the LED： Applications of LED on illumination field and its advantages over tile traditional lamp-sources are pointed out： Two ways to fabricate white LED and recent progress in white LED are included： At last important problems that, we must face are put forward