From a mud fortress to a city: Zhang Xuehai believes that from the Lungshan period through the Yueshi era and up to the Chou dynasty, the city at Chengziya was maintained for 1000 years. "If we can link these periods together, and figure out how the people in the city lived, then we could resolve a lot of problems about Chinese prehistory."
張學海認為，從龍山文化時期、相當於夏代的岳石時期、到周代，城子崖城址約持續一千年，「如果把這些時期串聯起來，弄清城址裡的人如何過活，那麼，在沒有文字記錄以前，中國史前史的問題，便可解決一大半」，他說。