Pear flowers on the posthouse road was a famous quote from the famous " Dream of the Red Chamber ", which read," Pear flowers bloom everywhere on the posthouse road." The meaning of this sentence was that on the desolate journey, the pear blossoms filled the road, forming a beautiful scene. This scene represented vitality and hope, making people feel warm and comfortable. In the novel, this sentence was used to describe what Lin Daiyu and her friends saw and heard on their journey, as well as the desolation and vitality they felt. Through this kind of description, the novel deeply depicted the complexity of human nature and the impermanence of fate. At the same time, it also showed the author Cao Xueqin's profound thoughts and rich cultural heritage. The description of the pear blossoms on the post road played a role in enriching the image, creating the atmosphere and revealing the theme in the novel. Through describing the beauty and vitality of pear blossoms, the novel vividly shows the life scene in the journey, and also makes the readers deeply feel the complexity of human nature and the impermanence of fate. These descriptions also help the readers better understand the theme and meaning of the novel, enhancing the novel's legibility and artistic value.