The structure of "Water Margin," also known as "Outlaws of the Marsh," is characterized by its episodic narrative and the interweaving of individual stories into a cohesive whole. The novel is divided into 100 chapters, each focusing on a specific event or character. This episodic approach allows for a wide range of characters and themes to be explored, creating a rich tapestry of stories that collectively form the larger narrative.

The episodic structure of "Water Margin" is a key factor in its success. It allows the author, Luo Guanzhong, to introduce a diverse cast of characters, each with their own motivations and backgrounds. This diversity is further enhanced by the inclusion of various subplots and side stories that contribute to the overall narrative. For example, the story of the 108 heroes who join the rebellion is told through a series of individual tales, each highlighting different aspects of their personalities and experiences.

The episodic nature of "Water Margin" also serves to maintain the reader's interest. By focusing on specific events or characters in each chapter, Luo Guanzhong creates a sense of anticipation and curiosity, as readers are eager to see how each story will unfold. This structure also allows for a greater depth of character development, as each character's story is given ample space to unfold and evolve.

Data supporting the effectiveness of the episodic structure can be found in the novel's enduring popularity. "Water Margin" has been translated into numerous languages and has influenced countless works of literature and film. The episodic narrative has proven to be adaptable to different mediums, making it a versatile and engaging storytelling technique.

In conclusion, the structure of "Water Margin" is episodic, with each chapter focusing on a specific event or character. This approach allows for a diverse cast of characters and a rich tapestry of stories, while also maintaining the reader's interest and facilitating character development. The novel's enduring popularity and adaptability to various mediums underscore the effectiveness of this narrative structure.