The Romance of the Three Kingdoms was a famous work of ancient Chinese literature. It told the story of the historical background of the late Eastern Han Dynasty, where the warlords fought each other, as well as the political, military, cultural, and character relationships between the three kingdoms. The main plot of the novel revolved around the historical events of the Three Kingdoms Period, depicting the growth, struggles, and struggles of the main characters such as Cao Cao, Liu Bei, and Sun Quan. The main theme of Romance of the Three Kingdoms was as follows: 1. emphasize loyalty and betrayal: Cao Cao, Liu Bei, Sun Quan and other characters in the novel have experienced the choice and test between betrayal and loyalty. Through their stories, the novel highlights the deep relationship between loyalty and betrayal. 2. The cruelty of war and the complexity of human nature: The novel depicted the wars and battles between the Three Kingdoms, as well as the life and death of the characters in the war and the changes in human nature. These descriptions made the novel even more shocking. 3. Carry forward the spirit of patriotism: Many characters in the novel are patriotic heroes who struggle and sacrifice for the interests of the country and the people. Through promoting the spirit of patriotism, the novel made people cherish the history and culture of the motherland and the nation more. To sum up, there are many aspects to Romance of the Three Kingdoms, but its most prominent theme is to promote loyalty, betrayal, war, humanity and the spirit of patriotism. It is a literary masterpiece with profound cultural and historical significance.