Abstract:

 According to History of the Three Kingdoms written by Chen Shou, Cao Cao's father, Cao Song, was once adopted by Cao Teng who was an official close to the emperor. This fact shows that we can not understand what is about the birth of Cao Cao's father. And, in the Spring and Autumn Period, the marriage to each other within the same clan was forbidden. Since the marriage relation between Xiahou and Cao had lasted for a long time, the saying of "Cao coming from Xiaohou" can not be true. Also, among China's collections of family genealogy, the ones of the Song Dynasty are very rare. And most of them have been emended only in the period of the Qing Dynasty or in the Republic of China. As for the ones emended in the period of the Ming Dynasty, it is hard to find. And the ancestors of the existing Cao genealogy were living in the late Tang dynasty and the early Song Dynasty. That's almost eighty years away from Cao Cao. What's more, in history, false surnames, granted surnames, and changed surnames are too many that the searching for Cao Cao's descendants is almost impossible.

Key words: Xiahou, Cao Cao, Cao genealogy, Cao Caos descendant, DNA