First of all, Nietzsche's Nietzsche's philosophy was once considered as an "action philosophy", a philosophy that claimed to maximize personal needs and desires. His philosophy has the momentum of despising and criticizing everything. This is an important reason why his philosophy is appreciated by postmodernism. In his first academic work, The Birth of Tragedy, he began to criticize modern civilization. He pointed out that in capitalist society, despite the increasing material wealth, people have not achieved real freedom and happiness. The rigid mechanical model suppresses people's personality, which is the passion of losing free thought and the impulse to create culture. Modern culture is so decadent, which is the disease of modern civilization, and its root is the atrophy of life instinct. Nietzsche pointed out that to cure modern diseases, we must restore human life instinct, give it a new soul and make a new explanation of the meaning of life. Inspired by Schopenhauer, he thinks that the noumenon of the world is the will of life. He is an extreme anti-rationalist, and he criticized any rational philosophy thoroughly. He believes that the role of reason is nothing more than solidifying the flowing history and framing the living reality with some eternal concepts. As a result, the process of birth, aging, illness and death of things is stifled, and life is stifled-the spiritual life of Europeans for two thousand years is centered on believing in God, and man is God's creation and appendage. The value of life, everything of people is pinned on God. Although the foundation of God's existence has begun to disintegrate since the Enlightenment, people still believe in and worship God because of the lack of new beliefs. Nietzsche's famous saying "God is dead" is a heartless criticism of God. He said that he was the murderer of God through the mouth of a madman, and pointed out that God should be killed. Christian ethics fetters people's minds and suppresses people's instincts. If a man is free, he will kill God. Philosophers since ancient times have been promoting their own interpretation mode of the nature of life reality. Nietzsche believes that this world is a world full of contingency, uncertainty and unpredictability. He said that there is no reality, and everything is fluid, unpredictable and evasive. The reason why human beings advocate rationality is that they expect rationality to bring freedom and happiness to people. However, on the contrary, reason goes against human instinct everywhere, causing greater pain. The new philosophy established by Nietzsche puts the will of life above rationality, which is irrational. As a challenge to reason, he put forward the theory of strong will. Nietzsche compared the different characteristics of strong will and rationality. The characteristics of rationality are: calm, accurate, logical, straightforward and abstinence; The characteristics of strong will are: passion, desire, wildness, initiative and fighting. Nietzsche believes that a strong will comes from life and belongs to life, which is the real life. Although life is short, as long as you have strong will, create will and become a strong spiritual person, you can realize your own value. As the highest value measure, strong will not only affirms the value of life, but also defends the inequality in the world. The philosophical value of Nietzsche's voluntarism is twofold. On the one hand, Nietzsche inherited the essence of the Enlightenment and embodied the awakening of modern consciousness. The positive affirmation of the value of life has caused people to think about the meaning and value of life and reposition life; The negative criticism of instrumental rationality and industrial civilization opened up modern irrationalism. On the other hand, criticizing rationality and denying tradition is also one-sided, which is the appreciation of postmodernism. His ethical thought reflects the interests of the emerging monopoly bourgeoisie.