The reason why the ancient supervisory system was able to achieve "check and balance of power" was because of the need for centralization of power.

The ancient supervisory system has made great contributions to the big bosses of the past dynasties. In addition to the prime ministers and generals, the inspectors are also the most valued people by the leaders. It is precisely because of this group of lovely talents that the emperor can know his subordinates well even though he does not have clairvoyance and ears, and they have made great contributions to the stability of national power. Whether it is the administrative department or the judicial department, you can see their busy figures. Sometimes, even if they are not seen in person, they may be looking for criminal evidence in a small corner that is not noticed.

In fact, the supervisory system has been in its infancy since the time of Qin Shihuang. The Qin State finally transformed from the position of the younger brother to the boss. It will definitely not allow people with ulterior motives to usurp power, so it is very important to supervise the people under its command. By the time of the Han Dynasty, these supervisors had the same name - governor, and there were also legal guarantees to ensure that they could exercise their rights normally. During the Wei, Jin, Southern and Northern Dynasties, the power of supervision was decentralized. It was impossible for a leader as smart as a leader to allow one family to dominate, so the supervisory department was split. In the Sui and Tang Dynasties, this system became more detailed. Everyone had different responsibilities and did not interfere with each other. This not only strengthened the central government's control over them, but also formed a micro-balance among them.

Although the official positions of ancient law enforcement supervisors were not high, and their salaries were not high. Their annual salary could basically guarantee a basic well-off level for a family, but they had great power, so they applied for this major every year. There are countless students, and the competition is very fierce, no less than Tsinghua University and Peking University. As long as the officials below the royal family are respectful to them, if their negligence at work is recorded in a small notebook and then reported directly to the emperor with long legs, it will be over.