This article introduces and analyses the philosophy of Nishitani Keiji(1900-1990)who is the main member of the Kyoto School. According his main work What is Religion, We may statement how he see the crisis of the western ivilization and try to overcome the problem of western nihilism by the Buddhist ?UnyatA position. Nishitani Keiji thinks that as long as the nothingness in the atheistic existentialism that Jean-Paul Sartre (1905-1980) presents as a humanism is still set up as something called nothingness-at-the-bottom-of-the-self from the position of man, the self-consciousness ego that has nothingness at it’s ground is still a kind of self-attachment. He also thinks that Friedrich Nietzsche (1844~1900) creates the philosophy of Overman to overcome the position of man and makes the nothingness to be not just a relative nothingness, but still can’t make it to be a absolute nothingness that can absolutely affirm everything in the world. He emphasizes that the ZUnyatA position of the MAhayAna Buddhism can reach the state of absolute life-sive-death, death-sive-life, so it can overcome the fundamental problem of western civilization.