With Kant as the boundary, Western philosophy has shifted from unconsciously man-made legislation for himself to consciously man‐made legislation for himself. And the core meaning of this so‐called "man legislates for himself" is rationality. Rationality represents the construction of subjectivity under the subject‐object dichotomy. However, the Confucian‐based Chinese philosophy attaches great importance to the group and despises the individual. As a result, China is still confined to the original state of the unity of nature and man, and has not been able to break through and develop the subject-object dichotomy, which affects the development of natural science. Learning from Kant's principle of subjectivity plays an important role not only in promoting individuality, but also in developing socialist market economy, science and technology, legal society, and artistic aesthetics. At the same time, the subject‐object thinking mode marked by subjectivity also injects vitality and vitality into the construction of a new unity of nature and man, constantly promotes Chinese philosophy to the world, and contributes its own strength to the pursuit of world philosophy.