Confucianism, Taoism and Mohism were the most famous in hundred schools of thought during the Warring States Period. Although they are opposites, they have a long history. Confucius, the originator of Confucianism, once asked Zhou to be polite to Laozi, the ancestor of Taoism; Mohism comes from Confucianism; Han Fei, a master of legalism, is a student of Xunzi, a master of Confucianism. Han Fei is deeply influenced by Taoism, as evidenced by Jie Lao and Yu Lao. Although the four schools have deep roots, they have also gone through the process of opposition and integration of struggle, combination and reorganization.

First, the opposition and communication between Confucianism and Mohism. Confucianism, Taoism and Mohism can be divided into two categories from the perspective of treating "people" and "society":

1, Confucianism and Mohism, although the two schools are antagonistic, Mohism originated from Confucianism, so how similar is "providence" and "destiny", "universal love" and "benevolence"! Both Confucianism and Mohism attach great importance to people's feelings, which is manifested as "people-oriented" and caring for society. However, Confucianism is the ruler's paradise for intellectuals, hoping to restore the heyday of "conquering the emperor by rites and music" and finally realize a "world for the public", while Mohism is the craftsman's paradise for the lower working people to establish small producers of "Shang Tong" and "Shang Xian".

2. Taoism and Legalism, Legalism and Taoism are closely related. Shen Buhai, Shen Dao and Han Fei, the master of legalism, were all deeply influenced by Taoist thought. Although the social views of these two schools are quite different, their starting points are very consistent: both of them are based on naturalism, and Taoism advocates "Taoism is natural" in order to restore the clan society of "small country and few people", and its essence is still to represent the lower intellectuals and laborers; Legalists, on the other hand, absorbed the naturalism of Taoism, defined human nature from the "evil" of natural animals, and formulated a set of control techniques combining law, technique and potential to serve the upper rulers in dictatorship.

Second, the integration of Confucianism, Taoism and Mohism after the Han Dynasty. Although Confucianism and Mohism, Taoism and Legalism have their own similarities, they have been continuously integrated since the Han Dynasty because of their different foundations. First of all, in the early Han Dynasty, we learned the lesson of Qin's death and used Taoism to package legalists. In the early Han Dynasty, the technique of Huang Lao prevailed, and its noumenon was "Tao", which was called "Tao gives birth to law". However, due to the different class interests they represented, especially during the period of Emperor Wu of the Han Dynasty, the comprehensive national strength was strong, so the alliance quickly collapsed, because the rulers could control people, but all laws were "natural" and absolutely impossible. So Dong Zhongshu came into being at this time. The method of "Yang Confucianism and Yin" combines Yin and Yang, that is, Legalism is the skeleton, Confucianism is the flesh and blood, and Yin and Yang are the clothes for decoration. In fact, the Confucianism reformed by Dong Zhongshu is an organic combination of Confucianism and law, which hit it off immediately and influenced the political history of China for more than two thousand years. From the Han Dynasty, Taoism and Mohism began to merge with each other, and also combined with Yin and Yang schools, especially the immortal magic in the pre-Qin period, forming the local religion "Taoism" in China. The strict organization and discipline of Jimo school were organically combined with the Taoist spirit, and the immortal magic was shrouded in Yin and Yang and the five elements.