Wang Meng's 'Butterfly' used the technique of stream of consciousness. Stream of consciousness is a literary technique that refers to the flow of consciousness in the novel (that is, the flow of thoughts, feelings, and emotions of the characters in the novel) to make the readers feel smooth and natural. In The Butterfly, Wang Meng used this technique to express the protagonist's psychological changes and character image. In the novel, the protagonist Huang Yongyu's thoughts and emotions are constantly changing. These thoughts and emotions are expressed through his dreams, hallucinations, memories, and other means. These techniques made the plot and characters of the novel more vivid and vivid, and also provided a unique reading experience for the readers. Therefore, it can be said that the use of the stream of consciousness technique in Butterfly made the thoughts and emotions in the novel more natural and enhanced the artistic quality and influence of the novel.