Abstract:
　　The Kondo effect, a phenomenon found in 1930's and interpreted by Kondo in 1964, still attracts much attention in recent years due to the great advance of the nanotechnology. In this talk, we firstly give a brief review on the Kondo physics and its experimental studies. Then, we focus on several explicit systems to show the nature of the Kondo effect like the single magnetic atom on the surface of the normal metal or graphene, quantum dot systems, and so on. Finally, a brief summary and outlook are given.