当下城市各级公共空间在地块层面存在割裂状态，主要表现在地块内外、地块之间以及它们与城市一般公共空间（广场、绿地、公园等）之间协同方面的断裂、隔离和缺失。但关于城市公共空间布局优化的研究目前多是在区域或其他大尺度上展开，在地块和街区层面对公共空间布局和效能关系展开的研究很少。. 本研究在城市设计语境下，致力于针对地块层面的公共空间进行高效布局模式和公共空间供应新指标的研究，既基于城市公共性伦理和效能优化的协同，也面向高密度建成环境对城市精细化开发、设计、管理的目的。本研究将针对中国代表性城市的中心商业区地块进行深入研究，并结合重点地块现场精研，充分利用ArcGIS和大数据并引进智能算法等新手段，揭示、论证地块公共空间的布局效能模型与关键供应指标，进一步促进效能与公平相协调的城市公共空间生产。

The current urban public spaces at all levels are fragmented at the block scale, mainly presented in the crack, isolation and deficiency between inside and outside of the plot, between plots, and between general urban public spaces (squares, green space, parks, etc ) and them. But the study of urban public space layout optimization is currently conducted at the regional level or on other large scales, there are few studies on the relationship between public space layout and performance at the block and plot levels.. . In the context of urban design, this study focuses on the efficient layout of the public space at the plot level and updating indicators of public space supply, which are based on the synergy of urban publicness ethics and efficiency optimization, and aim at the refinement of development, design, management of the high-density urban environment. In this study, we will conduct a further study on the central commercial district of China's representative cities, and combine with field research of key plots, make full use of ArcGIS and big data and introduce new methods such as intelligent algorithms to reveal the layout of the public space efficiency model and key supply indicators, and further promote the performance and fairness of the coordination of urban public space production.