1, Expression of Emotion: Emotion is usually used to express feelings between characters. Through the delicacy and touching of emotions, we can better express emotions and make readers or viewers more easily infected and touched by emotions.

2. Setting off the atmosphere: Emotion can also be used to set off the atmosphere of a work. For example, when describing a bleak or warm scene in a poem or novel, proper use of emotion can better shape the emotional atmosphere of the work.

3. Expression of theme: Emotion can also be used to express the theme of a work. Through the expression of emotion, the theme can be better conveyed, so that readers or viewers can deeply understand the connotation and significance of the work.