To provide scientific basis for sustainable development of pitaya industry in Guizhou, the possible planting area for pitaya were confirmed according to the meteorological index of the growth of pitaya based on integrated consideration of climatic factor, gradient and elevation by using spatial analysis function of GIS and the climate and geographic date recorded in the main meteorogical stations for 46 years (1960-2006) in Guizhou province, the climatic divisions of pitaya in Guizhou were divided into 3 areas(the most suitable, suitable, sub-suitable) objectively by screening unsuitable planting areas on the present land use map finished by using image classification technology of RS. The possible planting area for pitaya mainly distributed in Qiannan, Qianxinan and Qianbei. The most suitable area(8299.35hm2), suitable area(16 933.72 hm2) were mainly distributed in low-heat river valley at the south edge of Guizhou province with an elevation of 200～400m and valleys of Hongshuihe river, Nanpanjiang river and Beipanjiang river with an elevation of 400～600 m,respectively. And the sub-suitable area (22 874.19 hm2) was the largest.%为了对贵州火龙果产业的持续发展提供科学依据,根据火龙果栽培种植的气象指标,利用贵州省各县主要气象站点46年(1960-2006年)的气象统计资料,综合考虑气候因子、坡度、海拔高度等要素,利用GIS的空间分析功能,确定火龙果的种植区域.结合RS的图像分类技术,完成贵州省土地利用现状图,将不适宜火龙果种植的地块屏蔽,将贵州省火龙果种植气候区划分为最适宜区、适宜区和次适宜区3个等级.可种植区域主要分布在黔南、黔西南和黔北.最适宜种植区面积共计8 299.35 hm2,主要分布在贵州省南部边沿的低热河谷地带海拔200～400 m处;适宜种植区面积共计16 933.72 hm2,集中分布在红水河谷、南盘江河谷和北盘江河谷地带海拔400～600 m的区域;次适宜种植区分布面积最广,共计22 874.19 hm2.
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