" A Night in Royal Garment " was a long novel written by Cao Xueqin, a novelist of the Ming Dynasty. It was written in the early 17th century. The novel mainly tells the story of the Cao family, the commander of the Jinyiwei in the Ming Dynasty. With the destruction of the Cao family as the background, it shows the political struggle and cruel reality inside and outside the Ming court by describing the relationship between the family members. The main story of the novel is that the Cao family has been the Jinyiwei for generations. Their ancestor Cao Boyu once served as the commander of the Jinyiwei, so the Cao family has always enjoyed the special status of the Jinyiwei. The novel used the decline of the Cao family as the background to describe the grudges between the various members of the Cao family. Among them, Cao Wenzhao, the young master of the Cao family, had a political struggle with some people in the officialdom and eventually failed. In addition, the novel also described the corruption in the officialdom and the corruption of the Jinyiwei. Night in Royal Guards was a novel that described the political struggles and infighting in the palace of the Ming Dynasty. The plot was complicated and the characters were full. It was a classic in the history of Chinese literature.