The Study On Motive Mechanism Of The Evolvement Of Urban Spatial Structure Of LangFang City

With the implementation of the economic level in the cities and the improvement of reform policies about the land utilization system and the expansion of the urban space. As a very complicated phenomenon,the changing of urban spatial structure has caused great interest by scholars from different fields.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.The paper firstly analyzed the main spatial process such as spatial competition,spatial evolution,spatial balance and spatial diffusion etc.Secondly,the paper ,which takes LangFang as an example, recalls the process of city space expansion,analyzes mechanism and space structure features.Based on the characteristic and the problem of the urban spatial structure of LangFang,the paper has put forward the goals,principles and coutermeasures of the optimization in LangFang city.It offered the theoretical foundation with the development in the city and improvement of efficiency.