Zhang Xuehai states that an ancient city was discovered in Jiangzhai in shanxi (belonging to Yangshao culture, more than 6000 years ago), but the area of the city was only about 20,000 square meters. It is estimated that the city could hold no more than 500 persons.
張學海表示，大陸曾在陝西姜寨發現過古城址（屬仰韶文化，距今六千多年），但城址的面積只有兩萬多平方公尺，經估計，推測這個城址可容納五百多人。