Ba Jin's novel Sun and Moon mainly tells the life experience of a young man, Zhang Ming, in the early 20th century. In the novel, Zhang Ming experienced many contradictions and setbacks in his family, love, career, faith, etc. Finally, he found his true self and the meaning of life through self-transcendence and spiritual awakening. Through Zhang Ming's story, Ba Jin expressed his thoughts and reflections on the state of human existence. In the novel, Zhang Ming faced the predicament and confusion of life, feeling that his existence was just an illusory existence, and the essence and meaning of life could not be truly understood. This reflected Ba Jin's deep thinking about the state of human existence and the meaning of life. He called on people to pay attention to the meaning and value of their own existence and find their true self and life goal. In addition, the novel also showed Ba Jin's pursuit and love for romantic literature.