Democracy is a part of the Three People's Principles advocated by Sun Yat-sen and occupies a core position. It contains the contents of state system and political power. The development of civil rights thought has gone through the process of brewing, initial expression and formation. When Sun Yat-sen was a teenager, he studied in Chinese mainland, Honolulu and Hongkong, and deeply felt that the country was poor and weak. Since the Sino-French War in the 11th year of Guangxu in Qing Dynasty (1885), "I began to be interested in the revolution". In the spring of the 20th year of Guangxu in Qing Dynasty, he wrote to Li Hongzhang, advocating "learning from foreigners and strengthening ourselves". After the petition failed, it was put forward that "improving the motherland" should not be "peaceful means" but "Yi Wu". In the same year 10, Zhong Xing, the first bourgeois revolutionary group in China, was established in Honolulu, proposing "establishing a coalition government" and then planning the Chongyang Uprising in Guangzhou in the 21st year of Guangxu. After the failure of the uprising, he went into exile, absorbed a large number of western bourgeois civil rights theories, and "standardized" them, forming his own concept of civil rights, which showed that he "adhered to * * * harmony" politically. Twenty-six years after Guangxu, his thought of civil rights was rapidly formed, which complemented the civil rights propaganda of revolutionary intellectuals in China. In the 30th year of Guangxu, the concept of "Republic of China" was put forward. The following year, the China League was established and decided to "recover China and establish the Republic of China"; In the same year 10, the banner of "three principles" was unveiled in the preface, and "establishing the Republic of China" was formally summarized as "democracy". Sun Yat-sen founded the theory of civil rights, inherited the Confucian thought of "the world is public" and carried forward the spirit of anti-feudal tyranny of peasant movements in previous dynasties; Absorb western revolutionary slogans of freedom, equality and fraternity and western bourgeois political theories and systems, and adhere to the political concept of "sovereignty belongs to the people". Sun Yat-sen integrated the demands of "people-oriented" at home and abroad, and formed the most complete and advanced civil rights theory in China's old democratic revolution. Sun Yat-sen's theory of civil rights laid down the principles of democratic politics, namely: (1) "revolutionary procedure theory" in the process of democratic politics; (2) Carrying out the "party politics theory" of "* * * and politics" and "representative government"; (3) The people who realize democracy have the right and the government has the ability. (4) the "local autonomy theory" of implementing the democratic political construction plan; (5) "Five-power Constitution" is the blueprint for building an ideal government structure. In order to realize the idea of "all politics", that is, "direct civil rights", he put forward the theory of building a "civil rights political machine", wrote the general outline of the conference, and described the procedures and methods of implementing "preliminary civil rights". After the birth of the Republic of China, the Nanjing Provisional Government formulated an interim constitution. Sun Yat-sen believes that nationalism and civil rights have been realized and should be devoted to the implementation of people's livelihood. However, it turns out that this understanding is incorrect and unrealistic. He had to wage a war against Yuan Baofa and eradicate the three "old-fashioned" warlords, bureaucrats and politicians. In his later years, Sun Yat-sen kept pace with the times and criticized the "* * * and politics" and "representative government" of the western bourgeoisie. He believes that "the so-called civil rights system in modern countries is often exclusive to the bourgeoisie and becomes a tool to oppress civilians", and proposes to establish a system that "all belong to ordinary people, not a few people get it for personal gain" to "meet the needs of the current China revolution". The reinterpretation of civil rights is more radical, emphasizing the realization of "national politics" through the "national revolution" led by military action. His six speeches on civil rights in 13 (1924) were the final explanation of civil rights in the new stage, and made a theoretical construction for the bourgeois * * * peace plan with the Outline of the Founding of the People's Republic as the core.