本文由理論的角度，討論公共領域、公共性與公共空間的概念堂構。作者首先討論公共性之想像，包括了哈伯瑪斯、佛端斯特與傅里曼的公共領域觀點，然後，由列斐伏爾與索雅之公共空間生產的理論角度，宣稱公共空間的概念，並試圖驅教公共空間的男性布爾喬亞中心性。最後，由公司資本接收了都市之公共表現角度討論公共空間之終結，以及，以公共空間生產的角度提出另類公共空間計割，它其實就是另類城市一一市民城市的計劃。

This paper is an attempt to contribute to the theoretical reconstruct of public space. First， it deals with the discursive imaginations of the public sphere and the public domain， such as Habermas， Forester and Friedmann's ideas of the public. Then， the concept of the production of space from Lefebvre and Soja is adapted and the masculine bourgeois centrality of the public space is criticized. Finally， the corporate takeover of urban public expression and the alternative project of public space are discussed. The author points out the implication of the project of the alternative city， that is， the city belongs to the citizen.