Abstract
Based on historical maps and literatures, the appearance, quantity, distribution and development of city are first analyzed by quantitative and qualitative analysis method. Then, a line chart method, which reflects the evolution characteristic of ancient city in Sanqin, is proposed. Further, it is found that there are two peak times and two troughs during the development of cities in Sanqin. Finally, the trend of development and migration of cities in Sanqin is estimated, and the influence of nature, politics, military affairs, economy and transportation on the development of cities are summarised.
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