Freedom thought of xiaoyao (iiiisk) not only has a long history but also is Sui generis in the tradition of Chinese philosophy and culture. In Zhuang Zi's thought system, freedom thought of xiaoyao combine with Taoism of the metaphysical level, prove the possibility of the thought of xiaoyao from metaphysics height. Tao (it) is not only universal ontology, and is the source of value and the ideal of life. The true person, the whole person and the perfect person are all the personality image of "Tao" or the metaphor of "Tao". "Tao" and human are not isolated, freedom of xiaoyao are not separate from daily "in". Freedom of xiaoyao's cultural foundation lies in the "Tao", human nature is the "virtue" of "Tao". The true person, the supernatural person are the externalization of Tao and the virtue of human nature is internalization. "Morality" priority doomed that all people are born free. Freedom of xiaoyao is human nature, human is free in nature, freedom is one possible survival state and ideal. How can people achieve the ideal of xiaoyao freedom? Zhuang Zi believes that Tao is a priori supreme good. Good Tao's decide good human nature, it is good human nature to realize the foundation of life internal transcendence. Good human nature has universality, universality means equality. Because of human equality, theory of freedom which built on the basis of human nature theory has the characteristics of equality, universality and immutability.