Combining with the function role of urban building entrance space,this paper elaborated the ambiguity of meaning,transition proper-ties,spatial range expressed by the urban entrance space,pointed out that the urban building entrance space as an unbounded space,made the architectural space and urban public space environment appeared the mutual infiltration,mutual fusion of development trend.%结合城市建筑入口空间的功能作用，对城市入口空间所表达的意义、过渡属性、空间范围的模糊性等进行了阐述，指出城市建筑入口空间作为一个无界的空间样态，使建筑空间与城市公共环境空间出现了相互融合、相互渗透的发展趋势。
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