城市群是优化城市化布局和整合区域资源的重要空间组织形式，对推动城镇空间结构合理化具有重要战略意义。本文将2016年发布的《成渝城市群发展规划》中确定的42个区（县）市作为研究对象，运用城市首位度、位序—规模法则等方法，研究成渝城市群的城市规模分布规律，运用数理统计软件spss，对数据进行回归分析，得到一系列结论。结果表明：成渝城市群作为中西部地区的城市群，属于典型的双核首位分布城市，成都、重庆作为城市群的两极，吸引了大量人口迁移，大城市的聚集效应明显，两极的发展良好，城镇化率均远远超过四川省平均水平。四川其他城市发展较为落后，城市规模不大，还有很大发展空间。

Taking the 42 districts (county) as the research object in the Chengdu Chongqing urban agglomeration development plan published in 16 years, the urban scale distribution law of Chengdu Chongqing city group is studied by using the method of city first degree, position order scale law and so on. And the data are applied to the data by the mathematical statistics software SPSS. A series of conclusions were obtained by the regression analysis. The results show that the Chengdu Chongqing city group, as the urban agglomeration in the central and western regions, belongs to the typical dual core city of distribution. Chengdu and Chongqing as the two poles of the urban agglomeration attract a large number of population migration, the agglomeration effect of the big cities is obvious, the development of the two poles is good, the urbanization rate is far more than the average level of Sichuan province. The development of other cities in Sichuan is relatively backward, the scale of cities is not large, and there is still a lot of room for development.