Great unity means that the country is unified economically, politically, and ideologically and culturally, and cannot be divided. For example, during the reign of Emperor Wudi of the Western Han Dynasty, the country was unified. Politically: unification, effective fight against the invasion of Xiongnu. Economically: smallholder peasant economy, emphasizing agriculture and suppressing commerce. Ideological and cultural aspects: "oust all schools of thought and respect Confucianism alone." It established the dominant position of Confucianism in the Chinese ideological circle for two thousand years. The official proposal of the term "Great Unity" in China began in the "Gongyang Biography. Hidden AD Year" : "What is the meaning of Wang Yue? Great unity." The word "da" here is not the adjective "da", but the "da" of the verb "Zun da", "Yi" is the yuan, "Tong" is the beginning, and "Yi Tong" is the yuan beginning. The beginning is the noumenon of all things (including political society), and the original meaning of "unity" refers to the bottom-up subordination of political society to a metaphysical noumenon, so that this political society can obtain a transcendent existence value, rather than the top-down centralization and unification of the political range with a supreme power. Therefore, the original concept of "grand unification" is not the top-down establishment of a vast empire with broad territory, numerous nationalities, high concentration and uniformity, as modern people think. "Great Unity" emphasizes the foundation of mandated reform, that is, pay attention to the fundamental reconstruction of national governance and legal unity. In other words, the term "great unity" was mainly used to explain the theory of dynasty replacement, the explanation of the theoretical basis on which the dynasty was established, and the idea of the establishment of the early Chinese state. It was later extended to a high degree of political and cultural unity of the country. Xu Yanshu :" The king was ordered to make the first month of the year to unify the world, so that everything is one by one, so the word is unified." "Hanshu. Wang Ji Biography" :" The Spring and Autumn Annals "is so unified, six contract wind, Kyushu all through." Big, attention, respect; Unification means that all the princes of the world are united under the Zhou Tianzi. Later generations therefore called the feudal dynasty rule as great unity. China's concept of state rule originated from the Xia, Shang and Zhou generations in China, which was formed by the dynastic lineage condensed by the clan blood relationship, that is, in a certain dynasty, the monarchy was continued by the succession of sons and sons, "when the supreme power is in the hands of a specific royal family member, people can and will think that the supreme power is legitimate." On the contrary, one can accuse it of being illegal. After the founding of the Xia Dynasty, the territory controlled by it gradually became an inseparable part of the national subject, which created an important political tradition in our history, that is, to establish a real and recognized country, it must occupy a specific region and have the corresponding central power. This particular region is the region or "China". The occupation of the area gives one a strong sense of self-respect, and one can command and invade the surrounding areas; So as long as the ruling power is slightly weak, the stronger forces around will try their best to get in and seize the dominant power. The Xia and Zhou Dynasties of Shang Dynasty won their orthodox status only after they had achieved it. However, the concept of "grand unity" in the three generations period is only a vague consciousness of people, the so-called "under the whole world, there is no king; The shore of the land, all is the king's minister." The concept of a unified world has not been systematized and theorized. During the Spring and Autumn Period and the Warring States period, although Chinese society was divided and turbulent, it was an era of ideological prosperity of "a hundred schools of thought contending". The hundred schools of thought not only systematized and theorized the original concept of "great unity", but also added a new content, that is, strengthening the unification of the political order. In view of the chaotic situation of "the invasion of rites and music from the princes", Confucius put forward the ideal order society of "the invasion of rites and music from the son of heaven", "the king, the minister, the father, the son". Mencius advocated that "the king is righteous, the king and the people are happy together" the world is "set in one", that "there are no two days in the sky, and there are no two Kings in the people." Xunzi believes that "heaven and earth produce gentlemen, gentlemen govern heaven and earth." The gentleman is also the participant of heaven and earth, the 揔 of all things, and the parents of the people." Han Feizi believes that "one dwelling and two males", "two expensive families", "husband and wife co-rule" are the causes of the troubles. "Lu's Spring and Autumn" said: "The king holds one, and everything is right. One is to cure, the other is to cause chaos." Zhong said: "The Lord respects the inferior, the superior is respectful, the pedestrian is dressed, and the rule is also the highest." "Make the world two days old, and the world cannot be governed." If one country has two Kings, one country cannot be ruled. One family and two fathers, one family can not be governed. A husband's orders are not high enough. The people of Yao and Shun were not born to rule, and the people of Zhou were not born to chaos, so the chaos is on the top." Reference source: Encyclopedia - Great Unity