As a historical novel, Romance of the Three Kingdoms is an organic unity in which historical science and novel art are intertwined. We should not only take historical figures and events as the theme, but also have literary colors and literary techniques. At the same time, it is impossible to describe historical figures and evaluate historical events like historical works, nor can it be completely divorced from historical facts for artistic fiction. The task of the author of historical novels is to combine history and literature skillfully. The author of The Romance of the Three Kingdoms successfully completed this task, defining a historical framework of "long-term separation" in the preface and a historical framework of "long-term separation" at the end of the whole article, and establishing the separation and integration trend between these two frameworks in the main part of the whole article. The unification of the Eastern Han Dynasty inevitably evolved into the trend of three-thirds system, while Wei, Shu and Wu all had the ambition to unify the world, but in the end they irretrievably evolved into the unification of the Western Jin Dynasty. The vertical structure of a situation, two turning points and three stages emphasized by the author in the book is the basis of the author's layout, and the structural art of the novel presents a kind of neat beauty.