Abstract: Relativity and quantum mechanics were the central contributions to physics in 20^th century. Relativity nearly was Einstein＇s own work. But quantum mechanics was come from the cooperation by Max Born and his students. In all their life, Born and Einstein were good friends. Understanding their contacts, their friendship, and the academic arguments between them, is a good experiments or education process to today＇s people.

Key words: Max Born, Einstein, The Born-Einstein Letters