The Study on Motive Mechanism of City Space Expanding of Shijiazhuang City

City spatial expansion is the need and embodiment of city growth. People can have a right view on the stage in urbanization process and can predict the developing trend by studying the state of city spatial expansion, time-space regulations and motive mechanism. This paper, which takes Shijiazhuang as an example, not only recalls the process of city space expansion, analyzes machanism and space structure features, but also puts forward some advices for city expansion in Shijiazhuang.