Supported by current urban classification system and spatial influence research,and based on Voronoi diagram and breakpoint theory, the town system of Bijie was divided and its influence range was discussed. Results revealed the forty-one towns and four leves of Bijie' s town classification system in which west town is the highest level center, Salaxi town and Haizi Street town are the second highest level centers, and Ya-chi town, Zhuchang town and other six towns are the subsidiary centers through population. The classification system accorded with the practical development of Bijie.%以现有城镇等级体系与空间影响研究为支撑,以毕节市乡镇为基础单位,基于Voronoi图技术,结合断裂点理论,以乡镇人口为参考属性,对毕节市进行了乡镇等级体系划分,并探讨了乡镇影响范围.结果表明,毕节市是以市西办事处为最高级主中心,撒拉溪镇、海子街镇为次级子中心,鸭池镇、朱昌镇等8个乡镇为辅助,共41个乡镇4个等级的乡镇体系,符合当前毕节市发展的实际情况.
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