Now most philosophers admit that Heidegger, a German thinker, is the greatest philosopher in the 20th century. However, because he once joined the Nazi Party, he was appointed by the authorities as the president of the University of Freiburg from April 65438 to February 65438. Since the end of World War II, the entanglement between Heidegger and Nazi has not only become the most famous case in the history of philosophy in the 20th century, but also a serious ideological problem. Many early students of Heidegger, such as Marcuse, drew a clear line with their teachers one after another, and thought that Heidegger's political slippage was deeply hidden in his philosophy and needed to be deeply criticized and thoroughly removed. Famous artists such as Derrida, Gadamer and Habermas also participated. There are two key issues that have been debated for a long time in European and American academic circles: First, is this philosopher's political gaffes accidental or necessarily related to his thoughts? Second, if there is a necessary relationship, then is his thought Nazi? In fact, this big debate ultimately involves "What is philosophy? How to understand philosophy in the context of modern politics? " This core issue.