The specific background of Ba Jin's writing of "Cold Night" has not been publicly confirmed by official information. However, according to the literary nature and storyline of Cold Night, one could speculate from the following aspects: The Enlightenment Period of Modern Chinese Literature Cold Night was a masterpiece of modern literature. Its background could be traced back to the enlightenment period of modern Chinese literature. During this period, Ba Jin and others began to create a series of literary works that reflected the social reality of the time. Chinese Society in the 1930s The story of " Cold Night " took place in the 1930s, a period of unrest in Chinese society. War, inflation, economic crisis and other factors led to social instability and the suffering of the people. When Ba Jin wrote Cold Night, he probably reflected the reality of Chinese society during this period. The Exploration of Human Nature As a novel, Cold Night explored many profound human problems. For example, the exploration of good and evil in human nature, morality, kinship, friendship, and so on. When Ba Jin wrote Cold Night, he probably hoped to better understand the complexity and variety of human nature through this kind of exploration of human nature. The Uncovering of the Dark Reality In Cold Night, there were many revelations and descriptions of the dark reality, such as corruption in the prison and the injustice and injustice of the dark society. When Ba Jin wrote Cold Night, he probably hoped to arouse people's attention and reflection on social reality through the exposure and description of the dark reality.