Abstract: Between the nature in theoretical philosophy and the freedom in practical philosophy,there is an impassable gap.The problem is that people can't explain the relationship between nature and freedom by usual methods,which led to a separation of nature and freedom.If the possibility that logic constructs the world and the world returns to logic can be proved,then it will be known that logic is the necessary and sufficient condition of constructing the world,and this world is determined by logical patterns.Then take the thought of Dependent-Arising and Emptiness in Buddhism as a breakthrough point,it can be explained that the concepts of things are not inside things themselves but they are conceptual objects produced from people's consciousness,which are only expressed linguistically.As an extension of things' concepts,with a series of proofs in psychological philosophy,it can be explained that freedom is only the concept produced from people's consciousness.Therefore,the essence of freedom is a sense of freedom,and freedom is meaningful in the limitation of consciousness.Then,by returning the concept of freedom to sense of freedom as natural essence,the transition from the nature in theoretical philosophy to the freedom in practical philosophy will be realized.

Key words: the nature in theoretical philosophy, the freedom in practical philosophy, logic demenstration, sense of freedom