中文摘要：

分析辽宁省沈阳大连的核心作用，将辽宁省城市分为核心城市组（沈阳、大连）和外围城市组（其他城市）；再以人口、GDP和人均GDP为基本指标，利用Theil指数计算组内差异、组间差异和总体差异，利用KZ指数模型计算核心城市与外围城市的分化。结果表明沈阳大连与其他城市的分化总体上加大；分化具有波动性特征，分化在地域空间上也体现为辽中南城市群被以沈阳为核心的辽中城市群和以大连为核心的辽南城市群取而代之，其他地区城市聚集不明显；沈阳大连与辽宁省其他城市的分化是自然和社会经济因素综合作用的结果，分化机制主要有地理位置的先导机制、区域发展战略的催化机制和政府规划的引导机制。

英文摘要：

It is evident that the main development indicators centralize on Shenyang and Dalian cities which are the two core cities in Liaoning Province. All cities are divided into the core cities （ Shenyang, Dalian） and the peripheral cities （the others） . the difference between core cities and peripheral cities increases generally. Firstly, the spatial distribution of cities in Liaoning Province and the urban economic development are analyzed. Then, based on the population, GDP and per capita GDP, Total inequality, intra - group inequality, inter - group ine- quality are analyzed quantitatively by Theil index. The differentiation between core cities and peripheral cities is analyzed quantitatively by KZ index. It is concluded that the core status of Shenyang and Dalian is stable and as- cendant. There are different characteristics in the differentiation stages and the differentiation between Shenyang - Dalian and the other cities increase in the fluctuations.