" Voice of the Heart " is a novel that focuses on psychological description. As one of the protagonists, Zhao Xiaozhen adds depth and complexity to the whole story through the interaction between her inner world and the theme of the novel. In the novel, Zhao Xiaozhen was a character with great personality. Her inner world was full of contradictions and struggles. These emotions and thoughts constituted her unique personality traits. Through the communication between her and the protagonist Fang Ming, the author shows the various emotions and desires deep in the human heart, including the desire for love, the desire for success, the desire for freedom, and so on. Zhao Xiaozhen's thoughts and feelings also provided important enlightenment and guidance for the growth and exploration of the protagonist Fang Ming. At the same time, Zhao Xiaozhen also played an important role as the representative of the novel's theme. Her story expressed the author's deep thoughts on human nature and human society. It explored the struggles and contradictions in the depths of human hearts and how these contradictions affected the development of human society. Through Zhao Xiaozhen's story, the author showed the readers the dark side and good qualities of human hearts, and also called on the readers to think and reflect on human society and human behavior.