The structure of city grading refers to the combinative relationship between cities of different grades in a region. The Bamboo Slips Unearthed from the Han Tomb in the Village of Yiwan recorded the descriptions of the 38 cities in the county of Donghai with distinctions not only in style but also in grade. A comprehensive weighing-addition analysis of varieties of factors contributing to the classification of grades of the cities shows proximately 1:2:4 as the proportion of the grading number of cities in the county in the late East Han Dynasty. The structure of city grading manifests that the combinative relationship between cities in the county of Donghai agrees with the pyramid-pattern with the grading of the scale being inversely proportional to the number of cities in the day.

the Bamboo Slips Unearthed from the Han Tomb in the Village of Yiwan; in the late East Han Dynasty; the county of Donghai; structure of city grading