THE SPATIAL SPREAD OF THE BEIJING-TIANJIN-HEBEI URBAN ECONOMIC REGION
以京津冀为例，研究现代经济区中核心城市如何通过交通改善推动空间扩散，改变区域分工与生产规模。
In terms of theory,the powerful core will give rise to spatial spread in a spatial system. The effect of spatial spread will transmit following by the particular spatial growth-axis. Both express highway and railway have substitute for the traditional material transport upon condition that the facilities and technology of transportation improve. The improvement of spatial efficiency has changed both regional labor-division and productive forms of the original spatial system. Go step further, it will change the scale and structure of the original spatial system. Within the modern economic region, the velocity and frequency of the productive element flow becomes faster among economy-correlated spatial units. The productive style of Just in time become the important factor to bring about new spatial combination. Meanwhile, the efficiency of spatial transmit become another important factor to bring about new productive scale in original spatial system. The purpose of this paper is to interpret the general regularity of spatial economic movement through taking BeiJing-Tianjin-Hebei as example.