First, the secret folder is actually similar to a memorial hall. Emperor Kangxi put it into use at the beginning. The preservation and transmission of secret folders are more rigorous than ordinary memorial halls. Generally speaking, it is because of fear of leaking military information or local government affairs. Not everyone can resort to the secret folder, but it is usually enabled by the emperor's senior confidant, and the content of the report is very important. The emperor also has a perfect system for the management of secret folders, and generally does not borrow others' hands.
Second, the special class of the Qing Dynasty There was a special class in the Qing Dynasty, the Eight Banners nobles, and most of their children were attached to the imperial power. They are also involved in monitoring ordinary people, mainly Han people. Although most of these eight banners' children are idle, a few of them are the emperor's confidants to monitor the people, mostly to stabilize the local situation. Therefore, Han people or ministers can effectively control anything.
Thirdly, Manchu was a special spy agency set up by foreigners because they didn't trust Han Chinese officials, mainly to resist Han Chinese. Therefore, I support the children of the Eight Banners politically and hope to suppress civil servants. Ideologically, their large-scale literary inquisition was aimed at destroying the nine ethnic groups and economically resisting the Han people. Whether it is the officials of the former dynasty or the concubines of the harem, the status of the Han people is very low, mainly for the convenience of their own rule.