Based on Landsat TM data and GIS technology ,through the information of land-use change and barycen-ter migration theory ,the spatial evolution of land-use structure in the past 30 years in Guyuan County ,Hebei Province has been analyzed .The results showed that agricultural land and grassland were the principal types of land -use ,and the land-use barycenters experienced a significant migration in the study area from 1980 to 2013 .The barycenter of agri-cultural land has migrated toward northeast with the distance of 4 595 .79 m;the barycenter of woodland has migrated to-ward southeast with the distance of 3 820 .62 m;the barycenters of grassland and construction land have migrated toward northwest with the distance of 5 294 .75 m and 1 220 .91 m ,respectively ;the barycenter of water body has migrated lit-tle;and the barycenter of unused land has migrated toward southwest with the distance of 4 552 .13 m .Policies and hu-man activities are the main driving factors ,while natural factors play a promoting role in the spatial variation of land-use .%基于Landsat TM数据和GIS技术，通过土地利用变化和重心迁移理论对农牧交错区河北省沽源县30多年土地利用的空间演变情况进行分析。结果表明：研究区农业用地和草地占主要地类，1980-2013年土地利用重心有明显迁移；农业用地重心向东北迁移，迁移距离为4595．79 m；林地重心向东南方迁移，迁移距离为3820．62 m；草地和建设用地重心向西北方迁移，迁移距离分别为5294．75、1220．91 m；水域重心迁移距离较小；未利用土地重心向西南方迁移，迁移距离为4552．13 m。自然因素对沽源县土地利用空间变化起到一定的推动作用，政策推动等人类活动干扰则是主要驱动因素。
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