This paper had an analysis of the spatial structure and the hierarchy and also the random aggregation and physical mechanism of the central places of Hunan 3+5 city group by using a combined method of the Central Place Theory and Fractal Theory. The results are calculated as follows: The distribution structure of the 3+5 city group appears to similar to Christaller’s K=3 system, however, symmetry breaking phenomenon makes it belong to the level-46th market zone. With the first level central places being the center point, the second level central places present an obvious fractal structure characteristic. The third central places, however, present a insigniifcant fractal structure characteristic while the fourth level central place exhibit a more complex result, showing a double-form fractal structure.%以湖南省为例，运用中心地理论与聚集分形模型分析了“3+5”战略规划下城市群的空间结构与等级体系。结果表明：“3+5”城市群的空间结构兼有市场原则( K=3)与交通原则( K=4)的双重性质，且服从K=133的勒施市场等级指数，属第46级市场区；同时，“3+5”城市群以一级中心地为中心，其二级中心地空间分布紧凑合理，三级中心地较为松散，四级中心地呈现内松外紧的双分形结构。
展开▼
