The Mandarin Duck and Butterfly School of the late Qing Dynasty was a literary school from the 1900s to the 1920s. The New Generation period was from the late 1920s to the early 1940s. The general characteristics of these two periods are as follows: - The Mandarin Duck and Butterfly School period was from the 1900s to the 1910s, with Dream of the Red Chamber as its representative. Its main characteristics were the emphasis on love, marriage, and sex, as well as the criticism of traditional culture and morality. - The period of the new generation was from the late 1920s to the early 1940s, with Lu Xun and Lao She as the representatives. The main characteristics were the discussion of social problems and human nature, as well as the reflection of traditional culture and modern civilization. The works of this period also had a strong sense of realism and democratism. The works of these two periods have their own unique style and ideology, which are precious heritages in the history of Chinese literature.