Chen Duxiu put forward two slogans in the New Culture Movement: Mr. De and Mr. Sai. "Mr. Dede" means "democracy" and "democracy". The so-called "democracy" refers to democratic ideas and democratic politics. "Mr. Sai" means "science" and "science". The so-called "science" refers to the laws and spirit of modern natural science. The bourgeoisie preached democracy and opposed feudal autocracy, pointing the finger at Confucianism, the theoretical pillar of feudal autocracy; Advocate science and oppose feudal superstition and ignorance. The establishment of the two banners of democracy and science in the New Culture Movement has brought about earth-shaking changes in many aspects of China, and created great opportunities for the wide spread of new ideas and theories.