In many places, Mao Dun uses the description of natural scenery to make up the atmosphere and set off the changes of the characters' emotions, so as to show the characters' characters clearly. He did not write for the sake of scenery. He wrote for the sake of people. Sometimes it's because of the situation, sometimes it's because of the situation. It's because of the combination of the situation and the scenery. For example, in Chapter 7 of midnight, when describing Wu Sun Fu's state of mind of internal and external difficulties, the author always accompanies the description of natural scenes: gray clouds, thunder, rain roar, thick fog, golden sun, green woods, Qin like drops of water... These descriptions of symbolic colors and sounds are very harmonious with the description of characters' psychology in the novel.