He Yan was a Manchurian Red Flag man. When he was more than ten years old, he entered the Imperial Palace and studied in the Xian'an Palace inside the Xihua Gate. At the age of 18, he married the granddaughter of Yinglian, the minister in charge of the Ministry of Internal Affairs of the official Zheng Erpin, and at the age of twenty, he inherited the third-class light car position of his grandfather and became a minor official.
At the age of 22. He Yan became a third-class guard of the official rank of Zheng Wupin. Often with the emperor on tour, the shrewd and capable Hekun finally got a chance to become the emperor's honor guard at the age of twenty-three, and because he knew how to use the opportunity to show his talents in front of Qianlong, he finally became a minister four years later.

Since then, he has been continuously promoted to higher ranks, concurrently holding multiple positions, serving as the chief university soil, foreman of the military aircraft minister, concurrently managing the official department, the household department, the punishment department and other important positions, and the earliest, indeed shrewd and strong, for the official clean and honest, through yunnan case handling, Shandong accounting and other political achievements, consolidated his position. In terms of ability, Washu does have a superiority. However, with the growth of power, his selfish desires also expanded day by day, and gradually began to embezzle, gamble, and form parties for personal gain, he actively carried out industrial and commercial activities, opened his own pawnshop, set up silver trumpets, built coal kilns, and operated various businesses, not only becoming the first assistant minister of the dynasty, but also the richest man at that time.
He was the emperor's favorite extreme, the high rank of the official, the wide range of management, the great power, the Qing Dynasty rare, the history books record, and Yan sat in the official position for more than twenty years, promoted to the rank of forty-seven times, he was also the emperor's family, his son married the emperor's favorite ten princesses, this favor exceeded the convention, but also broke the balance of the administrative system, and Yan colluded with eunuchs, to understand the emperor's mood and dislike, and then prescribed the right medicine, and served the emperor very thoughtfully. He also gained power and wealth second only to the emperor.
In the fourth year of Jiaqing, the Qianlong Emperor died, and due to the replacement of the new emperor, the posts of impeachment and Yan were continuously sent to the hands of the Jiaqing Emperor. The Jiaqing Emperor pronounced Hezhen twenty major crimes and immediately ordered he to be arrested and imprisoned, and a few days later, Hezhen committed suicide in prison.
According to relevant records, a total of 4288 pieces of gold bowls, plates, etc., 119 gold basins, 5.8 million gold taels, 50,000 silver dollar treasures, jade treasures, antique calligraphy and paintings were found, and the number could not be counted. His family property was equivalent to the income of the Qing government treasury for fifteen years at that time. Of course, these properties have not been confiscated. Therefore, there is a folk proverb that says, "When Hezhen falls, Jiaqing is full."