中文摘要：

以国家森林公园为例，基于GIS技术，通过最近邻指数和热点聚类法分析中国713个国家森林公园的空间结构特征；运用栅格成本加权距离算法，计算1991年和2010年中国国家森林公园的空间可达性，并测算县域单元的整体可达性；利用空间关联方法分析了县域可达性的空间差异。结果表明：中国国家森林公园的空间分布总体上呈现出聚集分布的特点，国家森林公园的平均可达性时间从1991年的168．18min缩短为2010年的137．86min；可达性在全国的分布差异十分明显，可达性空间分布具有明显的交通指向性；县域可达性热点区域的分布呈现显著的热点一次热点一次冷点一冷点自东向西带状分布的格局。

英文摘要：

Low carbon economy, sustainable development and employment problems have been the focus of world attention. With the prosperity of ecotourism, the forest park in China gets its allaround develop ment. Forest park has been a leading role in the development of forest tourism industry. Through the devel opment of forest tourism in forest park, people＇s awareness of ecological protection was improved,and eco nomic development in the surrounding was promoted, which has an increasingly important role in promo ting regional economic development. The study of the spatial structure of forest park is receiving increasing attention but methodology so far has used qualitative rather than quantitative methods. The change of ac cessibility plays a prominent role of motive force to promote the regional economic development and region al spatial structure changes. Evaluation of accessibility generally includes network analysis, grid analysis and raster analysis. Based on an investigation of 713 National Forest Parks and using GIS and some quanti tative analysis methods,such as Nearest Neighbor Index （NNI） and Hot spot clustering,the spatial struc ture of National Forest Parks was investigated, and their characteristics and distribution for different strat egies were discussed. Based on matrix raster data covering the whole space, this paper calculated spatial ac cessibility of all counties in China using cost weighted distance method and ArcGIS as platforms. Then spa tial differences of county accessibility of scenic spots were discussed by using ESDA（Exploratory Spatial Data Analysis）. The results show that general National Forest Parks exhibited an aggregated distribution. Considering the accessibility, we find that the human scenic spots were more centralized. The average acces sibility was about 60.5 min, and the area where the accessibility of scenic spots was within 2 h reached 63.29% ,while the area where the accessibility was within 30 minutes accounted for 19.84% and the area located at central Tibetan Plateau