In Chinese history, many records may have been tampered with for political purposes, mainly including the following categories: 1. **Historical books and official histories**: The official histories of various dynasties, such as "Records of the Grand Historian", "Book of Han", "Records of the Three Kingdoms", "History of Song", etc., may have been influenced by the rulers of the time. In order to highlight the achievements of the rulers, the deeds of virtuous ministers are often exaggerated, while the deeds of those who have fallen out of favor or hostile forces may be belittled or omitted. 2. **Local chronicles**: Local chronicles are usually compiled by local governments and may be influenced by local power holders. During the compilation process, in order to cater to the power center or show the prosperity of the local area, some events and figures that are not conducive to the local image may be covered up or beautified. 3. **Literati's notes and travel notes**: Some literati may self-censor or selectively narrate in their works due to their personal stance or relationship with the power center, thus affecting the record of historical events. 4. **Emperor's family letters**: The emperor's edicts, family letters, etc. are often purposeful and may emphasize the importance of certain events or modify the evaluation of certain historical figures. 5. **Poetry and prose**: Literati expressed their political views through poetry and prose, often glorifying or criticizing certain historical events or figures due to changes in personal positions or political environment. 6. **Records of old systems and institutions**: Records of ancient systems may vary in different dynasties. Later rulers may glorify or belittle the systems of previous dynasties to highlight the rationality and superiority of their own rule. The tampering of historical records is not only for political purposes, but sometimes it may also be to conform to the ideology or cultural values of the time. Therefore, the analysis of historical documents often needs to be combined with the political and cultural background of the time for a more comprehensive interpretation.