Originated from legend, it comes from the residence of Guang Chengzi, a fairy in the Yellow Emperor era, and belongs to Juyi. According to legend, Chang's family is a descendant of light, an ancient immortal. Guang, a legendary Taoist immortal in the era of the Yellow Emperor, lived in seclusion in the stone room of Kongtong Mountain and taught the Yellow Emperor the way of keeping in good health. In ancient times, the place where people could live was called "factory", and Hou Guangcheng's disciples named it "factory" after their place of residence. It is said that some of Guang's descendants were doctors at the end of Shang Dynasty, but they were offended by remonstrance. Zhou Wang was very angry and wanted to kill him, but Wang Shubi dissuaded him. Zhou Wang was still angry and unwilling, so he simply removed his surname "Head", that is, the first word "Factory". Instead, the whole family was forbidden to call it "Factory" again. Since then, this branch factory has become a home. In ancient times, the word "factory" was abbreviated as "Zi", so the words "factory", "Zi" and "Zi" were both used for official leave, so "Zi" was also called "Zi", which was the ancient pronunciation of his surname.

In 1955, the word "よよ" is simplified to the word "factory", which is pronounced as ch m 4 ng (ㄔㄤˇ), but that is not the pronunciation of the mainstream surname. The surname of this factory is still pronounced as hà n (?ㄢ). Most clan members in the factory put it. It originated from Buddhism, from the movement of destroying Buddhism in Tang Dynasty, and it is a historical event. During the Tang Dynasty, a historical event called "The Difficulty of Huichang Law" occurred, that is, a large-scale campaign to destroy Buddha, which was also called "Three Wonders" with the campaigns to destroy Buddha by Tuoba Tao (reigned from 423 to 452 AD) and Yu Wenyong (reigned from 560 to 578 AD). Tang Wuzong Li Yan was born in June 1 1 in the 9th year of Tang Yuanhe (AD 8 14). His real name was Li Zhuo, and he changed his name to Yan Li ten days before his death. He was in office for seven years from 840 to 846, at the age of 33. During the reign of Tang Wuzong, there was one thing that was very worthy of attention, and that was "destroying Buddha". Because the year of Tang Wuzong's rule was Huichang, his campaign to destroy Buddhism was called Huichang Fa Nan in history.

Since the second year of Tang Huichang (AD 842), Tang Wuzong ordered all monks who violated Buddhist precepts to be secularized and their property confiscated. During this period, a monk claimed to be able to build a "sword wheel" and defeat the enemy. Tang Wuzong allowed him to try. As a result, the monk failed to make the trip and was killed. Since then, Tang Wuzong ordered to limit the number of monks in Buddhist temples, not to shave their heads privately, and to limit the number of maids kept by monks. Many monasteries were demolished and a large number of monks were forced to secularize. In February of the fourth year of Tang Huichang (AD 844), Tang Wuzong decreed that "it is forbidden to support Buddha's teeth", and at the same time it was forbidden to support and worship Buddha's bones in Wutai Mountain in Daizhou, Puguang Temple in Sizhou, Wutai Temple in Zhong Nanshan and Famen Temple in Fengxiang. If one person gives a sum of money, he will give a stick to twenty people; If monks and nuns receive alms in these places, they will carry 20 sticks.

In the fifth year of Tang Huichang (AD 845), Tang Wuzong began to destroy the Buddha on a larger scale. He ordered all monks under the age of 40 to be secular, and soon stipulated that they should be under 50. Soon, even people over 50 years old will be secularized without genealogy, and even Buddhist monks in Tianzhu and Japan will be forced to secularize. Hirohito, a Japanese monk, recorded this "difficult method" in detail in his Journey to Seek Dharma in the Tang Dynasty: Tang Wuzong took large-scale measures to destroy Buddhism, and more than 4,600 temples were demolished all over the world, and more than 40,000 temples and Lan Ruo were demolished. More than 260,000 monks and nuns became secularized, and became national second-tax households, and 60 million hectares of fertile land owned by temples and handmaiden were confiscated. Tang Wuzong's campaign to destroy Buddhism dealt a heavy blow to the temple economy, objectively increased the taxpayer population in the Tang Dynasty and expanded the country's economic resources.

Many monks and nuns were forced to return to the secular world and engage in normal work in the "difficulties in meeting the law." Buddhists don't have surnames, and quite a few of them can't reply to the surnames of the original laymen. Therefore, some people who take the pseudonym "Chang" as their surname are called Chang, which is called Chang for short, but the surname is pronounced as Shi.