Small Ancient City Site, it is located 200 meters southwest of Yujiayan Village, Panpan Town, Hangzhou City, Zhejiang Province, covering an area of 350,000 square meters and 2-3 meters above arable land, it is a Neolithic site of late Machiao culture.

Its age and the Central Plains of the Xia, Shang and Zhou Dynasties, and the Zhou Bai Wang South Tour basically coincided. Xiao ancient city site is another important ancient cultural settlement site after Liangzhu site in Yuhang, which is of great value to the study of the origin, development and relationship of Liangzhu culture.

In August 1997, the site of the small ancient city was listed as a provincial cultural relic protection unit in Zhejiang Province. In 2013, the small ancient city site was announced by the State Council as the seventh batch of key national cultural relics protection units.