Abstract: Subject is the soul of a novel.Any successful novel,though might be different in subject,has its clear and protruding subject.As a historical novel,The Romance of the Three Kingdoms,by telling the stories of separation and unification during that time,has succeeded the long historical tradition since early Qin Dynasty to take history as a guide,and has made it clear that reunification is the historical trend the aspiration of people.Therefore,The Romance of the Three Kingdoms is a masterpiece to sing for reunification,and it also shows a complex subject of separation and unification as well as rise and fall of dynasties.

Key words: The Romance of the Three Kingdoms, sing for reunification, historical separation and unification, rise and fall of dynasties