The humiliation suffered by the Chinese nation in a hundred years reached its peak in Japan's war of aggression against China. "Four Generations under One Roof" is based on the great background of the eight-year-long Anti-Japanese War, and describes the process in which the Chinese people living in a conquered city don't submit to the suppression of Japanese militarism and fight back, centering on the common people in an alley in Beiping. This play deeply explores the cultural psychology of the Chinese nation at the moment of life and death. It is a chronicle of the minds of civilians in occupied areas. The eight years of suffering humiliation and carrying burdens make the people in the alley thoroughly understand the dignity of a country, the dignity of a nation, and the dignity of human beings.