During his stay in the Prince's Mansion, Zheng He won the trust of the Prince of Yan with his diligence, cleverness, extraordinary intelligence and diligence, and was selected as a personal bodyguard by Judy. At this time, Zheng He's own excellent glorious tradition and leadership began to appear gradually. During the four-year "Battle of Jingnan", Zheng He and Judy fought side by side, fought in the south and fought in the north, and made many contributions, becoming one of the main heroes for Judy to seize power and ascend to the throne. After the Ming Emperor Judy, most of the military commanders and civil servants who followed him for many years were promoted and reused. Among them, Zheng He, the eunuch, was named "Zheng" by Judy and was promoted to be the eunuch in charge of internal officials. Because Zheng He is also known as the "three treasures", people also call him the "three treasures eunuch".