The history of the Wei, Jin, Southern and Northern Dynasties and the Song Dynasties were not missing from the "A History of China" series because these periods of history had a profound impact on the development and transformation of Chinese civilization. They were also one of the most complicated and important periods in ancient Chinese history. The history of the Wei, Jin, Southern and Northern Dynasties and the history of the Song Dynasty spanned a long time. It recorded a large number of political, social, cultural, economic and other events and figures, which played an important role in the study of ancient Chinese history and the development of civilization. However, the historical records of these periods were relatively scattered, and due to the background, political system, cultural differences and other reasons, there were certain differences with the historical records of other periods. It was difficult to study them. Therefore, these important historical periods were not missing from the series of The History of China.