1, historiography, Historical Records, the first biographical history of China, and Hanshu, the first biographical chronology.

2. Yuefu in Han Dynasty: Yuefu was established by the Han government to collect folk poems, that is, Yuefu poems.

3. Thought: Dong Zhongshu's thought of harmony between man and nature; Metaphysics came into being; The debate between ghosts and gods.

Historical Records is one of the twenty-four histories, formerly known as Taishi Gongshu or Taishi Gongji and Gong Ji. It is a biographical history book written by Sima Qian, a historian of the Western Han Dynasty. It is the first biographical general history in the history of China, recording the history of more than 3,000 years from the legendary Huangdi era to the early years of Emperor Wu of the Han Dynasty. In the first year of Taichu (BC 104), Sima Qian began to create Taishi Gongshu, later called Shiji. This book was used for 14 years before and after completion.

Hanshu is another important historical book in ancient China after Shiji, and it is called "the first four histories" together with Shiji, Houhanshu and The History of the Three Kingdoms. The book Hanshu mainly describes the history of 230 years from the first year of Emperor Gaozu (206 BC) to the fourth year of Huangdi (23 AD). Hanshu includes twelve chapters, eight tables, ten records, seventy biographies and one hundred * * *. Later generations divided it into 120 volumes with 800,000 words.