The biggest drawback of Qianlong is the pursuit of perfection. As an emperor, all you have to do is consider the trade-offs. There are trade-offs and imperfections. Because Qianlong pursues perfection, he can't compare with his father Yongzheng in means. After the cultivation of Kangxi period and the rectification of Yongzheng dynasty, the national strength of Qing Dynasty was strong. But in the late Qianlong period, due to the prosperous times, Qianlong suffered from many diseases of wealth, and the pursuit of perfection was one of them. As a result, the state treasury is empty and adulterers breed, so that Ganlong can only raise money through some dirty means to satisfy his own selfish desires, such as negotiating money, that is, illegal officials can be exempted from punishment by paying a certain amount of money. Therefore, the demise of the Qing Dynasty was the seed buried by Qianlong.