清朝对明长城防御体系进行部分调整和保留,通过指定通关关口和驿路线引导关内资源向蒙地的扩散,从而间接影响蒙地城镇的格局。城镇主要聚集在邻近驿路40km范围内,随后每隔40km以50%速率递减;城镇围绕关口聚集分布存在分形几何特征,并且流露“双分形”和“三分形”的趋势。 In the Qing Dynasty, some adjustments and reservations were made to the Ming Great Wall defense system, which led to the proliferation of resources within the customs through the designated customs clearance and post routes, which indirectly affected the pattern of towns and cities in the province. The towns mainly converge within 40km of the adjacent post road and then decrease at a rate of 50% every 40km. There is a tendency of the fractal geometry of the cities and towns around the intersection and the distribution of the “double fractal” and the “third fractal”.