在我国特大城市的发展进程中，公共服务设施及服务产业持续高强度集聚是其重要特征，并推动了特大城市中心区硬核的空间拓展，呈现出硬核间连绵融合的极化现象，而我国绝大多数的特大城市中心区尚不具备硬核完全连绵融合的集聚动力，使得中心区处于始终在极化而始终无法完成极化的不稳定的“半极化”状态，进而造成了中心区一定的结构失序，硬核功能定位模糊、产业业态竞争激烈、基础设施建设摇摆不定以及空间形态无序等问题。针对这些特征及现象，本项目在对“半极化”现象深入解析的基础上，梳理“半极化”结构的理论支撑体系，并借助引力模型作用机制，通过空间、产业业态及交通等三个层面六个要素的综合评价，构建SIT引力分析方法，通过对硬核间作用力的定量分析建立硬核间作用力网络，对中心区“半极化”结构的规律特征进行定量剖析，进而构建中心区半极化结构模式的理论框架，以多学科交叉的视野及方法，对中心区不稳定的结构形态进行定量解析。

An important characteristic in the development process of China's mega-cities is that the public service facilities and services industry continuing gathering with high strength. This promotes the space expansion of the hard-cores in mega-cities’ centers, showing a polarization phenomenon between hard-cores. However, the vast majority of our mega-cities’ centers have not enough gathered momentum for completely agglomeration which makes the centers in the state of unstable "half-polarization" state that means continuing polarization but never completed. Therefore, resulting in the disorder of centers structure, the vague of hard-cores functional orientation, the intense competition of industry activities, the wavering of infrastructure construction, and the disorder of space form. On this basis, the project analysis of the "half-polarization" phenomenon in-depth and combing theoretical support system. Then, by means of the mechanism of Gravity Model using six elements of three aspects as Space, Industry Activities and Traffic to construct the SIT gravity analysis methods. And established the biasing force network between Hard-cores through the quantitative analysis of hard-cores. Moreover, quantitative analysis the regularities of centers’ "half-polarization" structure, and then construction of the theoretical framework of the centers’ "half-polarization" structure model. This project try to use interdisciplinary vision and method to quantitative analyze the unstable structure model of centers.