Cao Song is a poet in the Tang Dynasty, whose word is Dream Sign, and he is from Shuzhou. Poems are mainly composed of five-character metrical poems, which focus on metrical patterns, writing more about landscapes and frontier fortress themes, with simple language and gloomy and desolate style. Cao Cao was a famous politician, strategist, writer and calligrapher in the late Eastern Han Dynasty, and also the founder of Cao Wei regime. He has made great achievements in politics, military affairs, literature and so on, and has had a far-reaching impact on later generations. Cao Song and Cao Cao, both surnamed Cao, lived in different times and had no direct connection with each other.