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 rise of the new culture movement was marked by the establishment of New Youth magazine. 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.

This slogan reflects the requirements of China's social development and the urgent needs of the people, and has effectively promoted the development of the New Culture Movement. However, this slogan still belongs to the nature of bourgeois old democracy and has the limitations of its class and times. It can't be combined with mass movements, and it can't treat China culture and western culture from the viewpoint of historical materialism, so it can't fundamentally overthrow feudal thought.