The changes in official positions in ancient Chinese literature involved many aspects. The following were some of the common ones: 1. Official title: In ancient China, official titles and their functions would change over time. For example, during the period of Emperor Wu of the Han Dynasty, the names and functions of the official positions such as Taichang, Doctor, and Taishi changed during the Tang Dynasty and Song Dynasty. 2. Promotion of official positions: In ancient China, the promotion of officials needed to go through examinations and selection. Different dynasties and different regions had different methods of examination and selection. For example, the imperial examination in the Tang Dynasty was one of the main ways to select officials. 3. Transfer of official positions: Officials can be transferred according to the actual situation during their term of office. The methods and conditions of mobilization would be different in different dynasties and regions. For example, officials in the Tang Dynasty could be transferred to other departments by being demoted. 4. Change in official positions: In some dynasties and periods, official positions will also change. For example, during the Ming Dynasty, some official positions were abolished, some were promoted, and some were split into other official positions. The change of official positions in ancient Chinese literature involves many aspects. Through continuous research and study, we can better understand the changes and functions of these official positions.