At the end of the Qing Dynasty, almost everyone from bureaucratic gentry to women and children knew such a legend: an emperor in the early Qing Dynasty was the son of the Chen family in Haining, Zhejiang. Who is this emperor? Some people say that this is Li Hong of Emperor Qianlong. This legend can also be found in some folk unofficial history. The first volume "Grand View of unofficial history in Qing Dynasty" and "Emperor Gaozong and Chen Haining's Family" have such descriptions: when Yong Zhengdi was a prince, he made friends with Chen Haining, and the two families had frequent contacts. This year, two families had children on the same day in the same month. Suppose the family is a girl and the Chen family is a boy. Three-dimensional life people hold and watch, but secretly change children. Chen Jia was stunned when the child was changed. But under the influence of each other, they dare not pursue and dare not make any noise. Shortly after Kangxi's death, the emperor gave it to Yin. After he acceded to the throne, several of Chen's men were also high-ranking officials and dignitaries. After Emperor Long ascended the throne, Chen was treated with courtesy. Six times he went south to Jiangsu and Zhejiang, and four times he went to the Chen family in Haining. When he left for the last time, he went to the middle door and said to Chen, "Don't open this door easily unless the emperor comes in person." Since then, the door has never been opened.

Those who hold the above views also put forward some other evidence. In Haining House, there are two tablets inscribed by the emperor, one is called "Airi Hall" and the other is called "Chunhui Hall". The word "love this day" comes from the China poet "The Book of Filial Piety". Later generations called the day when his son served his parents "the day of love". The word "Chunhui" originated from Meng Jiao's poem "An inch of grass is long, and three Chunhui is full of affection" in the Tang Dynasty.

Later generations often compare maternal love to spring. The inscriptions on these two plaques are in memory of your son and parents. Later, the girl who exchanged with Chen's son in Haining was raised by Chen's parents in Haining and married to the Jiang family in Changshu, Jiangsu. Jiang specially built a small building for her, which was later called "Princess Building". These historical materials make people firmly believe that Gan Long is the son of the Han people.

However, some people raised objections.

There are ten princes and six princesses in Yong Zhengdi. Dragon is his fourth son. It is unreasonable to exchange children with other surnames for their own children to inherit the throne. This is the most convincing argument.

Secondly, judging from the relationship between the Qing emperor in Haining and Chen, it is purely the friendship between the monarch and the minister. Chen was a famous family in the early Qing Dynasty. During the years of Kangxi, Yongzheng and Qianlong, the Chen family lived in a higher vocational school and had a successful career.

In the early years of Yongzheng, in order to meet the needs of economic development and people's life in the lower reaches of Qiantang River, Zhejiang seawall was built on a large scale. However, Yong Zhengdi was busy with government affairs, and the damage to the dam by the tsunami was not serious enough, so he couldn't go there in person.

After Long ascended the throne, he attached great importance to this project. He has visited southern China several times and been to Haining four times, so when he arrives in Haining, he has to have a suitable residence. Chen is the father of generations of Kang, Yong and Gan. His home is in the scenic spot of Haining, with pavilions, flowers and trees, which naturally becomes the place where drivers stay. This garden was originally named "Jiaoyuan" and was renamed "An Lan Garden" by Emperor Qianlong. "Peace" means that water does not flow. So Emperor Qianlong came to Haining to inspect the seawall project instead of visiting his parents.

Chen Yuanlong said that his father was over 80 years old, so he put forward the word "Love Suntang". It is also mentioned that in June of the fifty-fourth year of Kangxi, the word "filial piety" and the plaque "Chunhuitang" were presented to Huang Shouwu, the wife of his younger brother Chen, for forty-one years. In other words, the inscriptions on these two plaques were written by Emperor Kangxi according to the instructions of his liegeman, and have nothing to do with the meaning of filial piety. Therefore, some people say that Gan Long is