According to legend, Qianlong is not Yongzheng's own son. But Chen Ge's son in Haining. On the day when Prince Yong (Yongzheng) gave birth to a child, it happened that the old lady also gave birth to a child, but the former was a girl and the latter was a boy. At this time, when Yongzheng heard about it, he ordered his family to invite Chen Ge, and stressed that he must take the children with him. Then, on the pretext that Fujin wanted to look after the children, he took the children into the back room and replaced the girl with Chen's. Chen Jia later discovered that it was wrong, but he was afraid to tell anyone. Unexpectedly, this young man was brilliant, won the love of Emperor Kangxi and Yong Zhengdi, and eventually became a king. Legend has it that when Qianlong visited Jiangnan six times, he secretly went to Haining to visit relatives.

However, some scholars believe that Qianlong is not the eldest son of Yongzheng, which means Yongzheng is not worried that no one will inherit his throne. Moreover, at that time, the battle for the throne had entered a white-hot stage. How dare Yongzheng exchange children with others and leave excuses for his political opponents? So the mystery of Qianlong's life is false.