Through the concept of vertical and horizontal comparison among metropolitan,urban agglomeration and cities＇ synchronization,this paper argues that their basic characteristics are more similar,that is to say,the central city and peripheral cities have geographical proximity,transport accessibility,close economic ties,complementary industrial structure,and so on.From the personality traits of view,the difference lies in their development stages,geographical spatial scale,the number and position of the central city,the final development state.metropolitan and urban agglomeration tend to integrated-trend of economic development,while cities＇ synchronization emphasizes homogeneous-trend of social development.%通过对国内外都市圈、城市群与同城化概念的纵横比较,认为三者的基本特征较为类似,都要求中心城市与外围城市之间具备地域的相邻性、交通的可达性、经济联系的紧密性、产业结构的互补性等特点。从个性特征看,三者差异在于发展阶段、地域空间尺度、中心城市的数量与地位、最终发展状态等方面的不同,都市圈与城市群倾向于一体化的经济发展态势,而同城化强调的是同质化的社会发展态势。
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