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中文摘要：
运用ArcGIS技术,以1km×1km栅格为基本评价单元,选取了地形、气候、植被、水文等自然因子,构建了基于人居环境指数的关中-天水经济区人居环境自然适宜性评价模型,对人口分布做了相关分析,在此基础上,分析了临界适宜地区的适宜性与限制性因素。研究表明：关中-天水经济区的人居环境指数介于21.51-84.62之间,整体分布态势是从西北向东南递增;该区包括四个不同的区域,分别是临界适宜区、一般适宜区、比较适宜区和高度适宜区。结果显示：高度适宜地区0.0035万km^2,占该经济区总面积的0.04%,相应人口占总人口的0.02%;比较适宜地区约3.43万km^2,占总面积的42.74%,相应人口占总人口的40.06%;一般适宜地区约4.19万km^2,占总面积的52.35%,相应人口约占总人口的56.13%;临界适宜地区约0.39万km^2,占总面积的4.87%,相应人口占总人口的3.79%,是人居环境较为恶劣的区域。
英文摘要：
Based on Geographic Information System,we set up the human settlement environment index（HEI） model and evaluated the natural environment suitability of human settlements in the Guanzhong-tianshui economic region by choosing terrain,land cover,climate and water condition as the evaluation factors,and made an analysis on the population distribution.The results showed that the HEI（between 21.51 and 84.62）of Guanzhong-tianshui economic region increase from northwest to southeast in general.There are four different areas in this economic region as follows： the common suitable region;rather and comparatively suitable region;the critical suitable region and the high suitable region.The high suitable region,with a land area of 0.0035×10^4km^2,accounting for 0.04% of the total area and 0.02% of population of the economic region;The rather and comparatively suitable region,with a land area of 3.43×10^4km^2,accounting for 42.74% of the total area and 40.06% of population of the economic region;the common suitable region,with a land area of 4.19×10^4km^2,accounting for 52.35% of the total area and 56.13% of population of the economic region;the critical suitable region,with a land area of 0.39×10^4km^2,accounting for 4.87% of the total area and 3.79% of population of the economic region,which is the most inappropriate area for the human.
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