The memorial is one of the important official documents, also known as passbook, post or fold. First used in Kangxi period, it was widely used after Yongzheng, and a fixed system was formed in Qianlong period. It lasted for more than 200 years until the Qing Dynasty was abolished. As the memorial is the most important official document after Yongzheng in Qing Dynasty, it covers a wide range of contents, almost summarizing the political, economic, military and cultural aspects at that time.
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The memorial was sent to the palace, and after being instructed by the emperor in calligraphy, it was called Zhu Pi Memorial. After the Yongzheng dynasty, after the memorial was approved by Zhu, but before it was returned to the performer, it was routinely copied by the military department so that the relevant government offices could copy it and file it for future reference, which was referred to as "recording the memorial" or "recording the deputy".
There are also a few memorials (such as the folding of official stories), which the emperor handed over to the military department for the record without instructions, and no copies were recorded. There are also some confidential documents, which are called "staying in China" because of the requirements of the performer or the emperor's opinion that they should not be made public.
Shortly after Yong Zhengdi acceded to the throne, he also ordered Emperor Kangxi's Zhu Pi's memorial and his approved copies to be returned to the palace for preservation at the end of the year, and individuals were not allowed to save and copy them privately, which became customized from then on. Previously, during the reign of Emperor Kangxi, there was also a provision for surrendering "royal approval", but it was not strictly enforced.