因應台灣社會住宅長期不足的議題，2015年台北市推動公共住宅政策，未來將更多興建社區住宅之機會。而過去台灣的建築基地開放空間常欠缺整體規劃，開發商為取得容積獎勵而拘泥於形式和僵化的規劃；或是鄰里間無系統地規劃而形成零碎或封閉的開放空間，影響了民眾的使用性，更造成都市的擁擠、視覺景觀等環境問題，因此，如何規劃開放空間提高民眾使用是值得深入研究的問題。
　　本研究是以空間結構的角度探討社區開放空間使用性，並將研究結果對六張犁公共住宅案設計操作。以類似條件之台北市國宅社區進行研究對象，調查使用強度，及探討高低密度與空間結構的共通性。研究分析可歸納以下結論：1.類似開放空間密度的社區中，不同的配置型態所呈現出使用強度差異性大；2. 大型社區之開放空間的使用強度主要受配置類型、空間完整性及其它環境因素影響；3.以實際人潮分佈觀察紀錄，界定出高強度活動空間，並繪製出其環境構成，做為設計開放空間的配置發展依據，增加設計的實用及合理性。

　In respond to the issue of long-term insufficient social housing in Taiwan, Taipei City promoted public housing policy in 2015, and there will be more opportunities in residential community construction in the future. However, in the past, the open space of building lot in Taiwan were often lack of overall planning, developers rigidly adhered to form and rigid planning, or there was no systematic planning between and among neighbors and thereby causing scattered or closed open space, which not only affects the public’s usability but also causes environmental problems such as crowding, visual landscape etc. in the city, therefore, how to plan the open space to improve the public usability is the issue worth in-depth study.
　This study probes into the usability of community open space from the perspective of spatial structure, and applies the study result to the design operation of Liuzhangli public housing case. It takes the national housing community of similar conditions in Taipei City as the object of study, so as to investigate the use intensity and probe into the commonality between high-low density and spatial structure. The study analysis can conclude the following conclusions: 1. In the community of similar open space density, different configuration types demonstrate greater differences in use intensity; 2. The use intensity of the open space of large-scale community is mainly affected by configuration type, space integrity and other environmental factors; 3. Observe and record according to the actual crowds distribution, define the activity space of high intensity, and prepare the environmental structure thereof as the basis of configuration and development of designed open space, and to increase the design practicability and reasonability.

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