In 2012,China's urbanization rate reached 52.57% and cities entered into the crucial period of overall transformation,meanwhile,new changes and patterns emerged in urban scientific development.Firstly,even though the pace of economic development in eastern cities slowed down,the livelihood security,ecological environment and city supporting capacity improved significantly,which means the strategy of transformation and restructuring got some achievements.Secondly,gradient features of city development still remained obviously among provinces,what's more,some ranks got across the original gradient order.Thirdly,small and medium-sized cities had outstanding performance,which contributed to improvement in urban scientific development.However,the inequality among different kinds of cities was still serious.Faced with the complex domestic and international development environment,how to keep the main line with development mode transformation and further promote the economic ,social and ecological transformation will be a great challenge to China. <<