Spatial Pattern and Spatiotemporal Evolution of China's National Historic Cities
运用GIS方法，从微观、中观、宏观尺度分析中国国家级历史文化名城的空间分布差异与时空演变特征，发现其分布不均且从东向西递减，并逐渐从大城市向中小城市扩展。
With GIS method and the concept of spatial scale and regional difference in human geography,the paper first analyzes the spatial distribution and disparity of national historic cities,and then studies the characteristics of its evolution with micro,medium and macro scale.The conclusions show that the spatial distribution of national historic cities at a county level is more uneven than at a city level.The number of national historic cities with county-level is few,and their distribution is dispersed.Meanwhile,the paper explores that the national historic cities at city level are concentrated in the central and eastern of China,and are gradually forming a high-density region.In provincial level,the number,density,and covered area of the national historic cities and its proportion to the total area are greatly different in geographical space.The three batches of national historic cities approved since 1982 separately show their cores in southeastern,northern,central and western China.Seeing from the spatiotemporal evolution in the nationwide,the national historic cities are unbalance distribution and its number has decreased obviously from eastern China to western China.And the spatiotemporal evolution demonstrates the national historic cities are expanded from large and medium size cities to medium and small-size cities,from central cities,middle cities to edge cities,border cities and the cities with significant regional characteristics,from the municipality directly under the Central Government,the provincial capitals to the prefecture-level cities and the county-level cities,and even to a district of a city.The approval and development of national historic cities are approaching scientific and detailed-oriented direction with the consideration of unbalanced distribution in regional and different scale.