Although not as old as Jia Hu bone flute, the pottery urn is one of the most primitive wind instruments of Han nationality, and most of them are made of clay. According to archaeological research, Yan was born in prehistoric times, with an upper limit of 7000 years.
It has been unearthed in many places in China, including Xi 'an Banpo Site, Jingcun Site in Wanrong County, Shanxi Province, Longshan Cultural Site in Shandong Province, Huoshaogou Site in Yumen, Gansu Province, Houjiazhuang Site in Yinxu, Anyang, Henan Province, Yijing Village in the suburb of Taiyuan City, Hemudu Site in Yuyao, Zhejiang Province, etc.