He was also an abacus operator in the Ming Dynasty. He has been doing business in the middle and lower reaches of the Yangtze River since he was 20 years old. Because of the need of business computing, he has been paying attention to mathematics, visiting famous teachers and collecting books extensively. He is the author of "Arithmetic Unified Family" and is known as "the originator of abacus calculation" in China. The former residence is located in Tunxi District, Huangshan City. It was built in the period of Zheng De in Ming Dynasty (1506- 152 1) and has a history of more than 490 years. Sitting in a two-story building with a three-brick wooden structure facing south, with a horse head wall and a small blue tile, it is a typical Huizhou residential building in the Ming Dynasty.