As an important member of the feudal royal family, the importance of the royal wet nurse is self-evident. In the feudal dynasty, the wet nurse had many functions, while in the Qing dynasty, which had the highest feudal degree, the wet nurse system was formed on the basis of inheriting the Ming dynasty system and combining with Manchu characteristics.

The universal role of wet nurses in ancient feudal dynasties: the first aspect: in the case that the imperial concubine had no breast milk or was weak, she could provide high-quality breast milk for her heirs and improve their survival rate. The second aspect: to a certain extent, the damage between concubines can be avoided from spreading to the heirs. The third aspect: restore the body of the emperor's concubines as soon as possible and keep the body perfect. The fourth aspect: sever the emotional connection between the heirs, especially the prince and his biological mother, so as to avoid the phenomenon that the biological mother or consorts may threaten the rule of imperial power and the stability of the throne after the prince ascended the throne.

By the Qing Dynasty, the role, selection, rewards and punishments of wet nurses had formed a relatively scientific, perfect and systematic system, and wet nurses had its special influence and lofty position in the royal family and the politics of the Qing Dynasty. Moreover, the emperors of the Qing Dynasty were basically raised by wet nurses, so the emperors of the Qing Dynasty maintained a respectful attitude towards the royal wet nurses during their reign.

The function of wet nurse in Qing Dynasty, on the tombstone of wet nurse Guaerjia of Emperor Kangxi, recorded in detail the functions of wet nurse: all good care, careful care, dressing in time, frugal diet, staying awake, preventing suffering and all duties in courtesy. That is to say, in addition to breastfeeding the princes, their food, clothing, housing and transportation, including the etiquette teaching of disease prevention and control, also belong to the functional scope of the prince's wet nurse. For example, in the Qing Dynasty, smallpox, plague and other diseases raged for nearly 300 years. In addition, the wet nurse also has the responsibility of education. They usually start from their simple feelings and guide the people they feed to become kind. Therefore, the diligence of the Qing emperor was not fatuous, which was directly related to the wet nurse system of the Qing royal family.