关键词: 分形理论, 分维, 城镇体系, 规模结构, 空间结构, 定西

Abstract: Taking Dingxi County of Gansu Province, this article studies the size distribution and space distribution of city and towns in the Western China based on the fractal method. The conclusion shows that the distributions take on fractal structure: (1) The size-scale structure is loose; the law of the primate town is too big; the middle town is absent; (2) The spatial distribution is linear, and the mostly small towns lie on a geographic element which is the Zuli river, Longhai Railway and 312 National Artery; the capacity of spatial interaction is weak. At last some advice for advancing structure of the urban system based on studying result are proposed.

Key words: fractal theory, fractal dimension, urban system, size-scale, spatial distribution, Dingxi County