Problem novels are a type of novel that is problem oriented. They usually contain some complicated plots and character relationships. The reader needs to think and solve the problem by himself to understand the story. There were many reasons for the emergence of problem novels, the most important of which was the rise of modernist literature. Modern literature emphasized the abstractness and complexity of the literary form and structure, and pursued the inner contradictions and conflicts of the characters while letting the readers think and feel for themselves. In addition, problem novels could also be influenced by other factors such as the reader's cultural background, reading experience, life experience, and so on. The readers needed to have sufficient background knowledge and comprehension ability to better understand and enjoy the problem novel. The content of a problem novel depended on the author's intention and plot. Some authors might explore the meaning and value of human existence by raising questions about philosophy, history, culture, etc., while others might express the complexity and contradiction of human nature by describing some character relationships and plot contradictions. The problem novel was a challenging and thoughtful literary form. The readers needed to read and think carefully before they could understand the plot and the relationship between the characters.