This article argued that the birth mother of Emperor Qianlong was not the Han “Qian”，but the daughter of Peng，a Han who lived in Baodi prefecture，and her father was Manchurian Niuhuru Lingzhu. Lingzhu and his ancestors had some of blood lineage of Han，so the daughter also had plenty of blood lineages of Han. Therefore the son she had with Prince Yinzhen，as known as Emperor Qianlong，also had blood lineage of Han，and his blood lineage of Han was more than that of Manchu，and combined with some blood lineage of Mongolian，which made him a mix-blood of Han，Manchu and Mongolian. This article argued that there are a lot of problems with the imperial edict which conferred the birth mother of Qianlong as “Qian”. In this article，the author proved that the birth mother of Qianlong could not be “Qian”，but the Niuhuru. The reason for the “Qian” appeared in the imperial edict is as followed. Prince Yuntao who wrote down emperor’s verbal instructions used stenography and abbreviation to write down Niuhuru as Niu. However，due to his careless handwriting，the officials who wrote imperial edict mistaken it as “Qian”. They didn’t notice the mistake until they wrote it down on the golden book and gave it to the awardee. Yuntao who made this mistake was then punished for mistaking the name of imperial concubine. The birth mother of Emperor Qianlong was the daughter of a Han，which is also an important fact that proved intermarriage between Manchu and Han was forbidden but actually existed in Qing dynasty.