Ancient Chinese history was indeed mostly based on "official history". These official histories were written and recorded by the government and usually had high authority and credibility. However, unofficial history did exist. It was written by folk people or different interested parties. There might be some inaccuracy or missing situations. Unofficial history may be more realistic and closer to historical facts than official history, but there may also be some subjective and prejudice. Because official history and unofficial history often came from different classes and groups, with different writing purposes and interest tendencies, the gap between the two could be relatively large. When we read history, we need to make a comprehensive analysis and judgment of official history and unofficial history to obtain more comprehensive and accurate historical information. At the same time, we also need to maintain an objective and fair attitude towards history to avoid blind superstition or excessive criticism.