At least 30% of the events recorded in history books are fictional, 30% are illogical, 30% are real events, and 10% is logically complete. No matter when the official history is compiled, it is later than the dating time of compiling history. Many actual events depend on some written records at that time or the written records of the previous generation, and many of these deeds can not be proved logically, especially the process of a large number of events, which are recorded by literary means.

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In ancient times, there were "left history" and "right history", and "left history" recorded the words of "right history" Later, Zuo gradually accompanied the emperor and was responsible for recording the emperor's daily life, words and deeds, gains and losses of government affairs, also known as the historian of taking notes; You gradually became a historian in charge of compiling and editing the official history of the previous dynasty. As early as Xia, Shang and Zhou Dynasties, historians were all important officials around the king and a group of people with the highest cultural level in the country.

It is necessary not only to record the words and deeds of the king, but also to raise objections to the words and deeds of the king, which is equivalent to the post of historian later. We should make suggestions to the king and express our opinions on state affairs. This is just a historian's post, and he also undertakes the tasks of observing astronomical phenomena, praying for sacrifices and communicating with heaven. This is like a wizard. Historians at that time were a combination of witchcraft and history, both of which came down in one continuous line, either father and son or master and apprentice. This is to train them to read and write from an early age. So family historians are very common. For example, Sima Qian directly inherited the position of Taishiling from his father Sima Tan.