Sun Yat-sen was a great figure who stood at the forefront of the times in the 20th century. He initiated and led the bourgeois democratic revolution, put an end to China's feudal autocracy and promoted China to become a modern country. He put forward and advocated the "Three People's Principles", paid attention to the issues of nationality, civil rights and people's livelihood, and initiated the political democratization in China. He insisted on saving the country by industry, devoted himself to transforming a feudal agricultural country into a "socialist" industrial power, and constructed a blueprint for China's future economic modernization; He inherited advanced culture and tried to clean up the pollution of feudal thoughts with modern civilization, which promoted the modernization of traditional culture in China and made important historical contributions to the great rejuvenation of the Chinese nation.