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土地生态安全问题直接威胁着区域的可持续发展,探索其时空特征有助于分析区域间土地生态格局.采用1980、2000、2010以及2019年四期天津市Landsat TM遥感影像为数据源,在ArcGIS和GeoDa等软件的支撑下,利用土地利用动态度的方法,测算研究区土地利用变化,再运用土地生态安全指数和空间自相关分析法,研究天津市各区土地生态安全的空间相关性及内部异质特征.结果表明:(1)近40年天津市土地利用变化剧烈,建设用地不断扩张,耕地、未利用地面积持续缩减;(2)土地生态安全综合水平处于高安全区,蓟州区生态安全等级最高,中心城区、滨海新区生态安全水平较低;(3)各区土地生态安全空间异质性不明显,空间集聚性较强.“,”The problem of land ecological security directly threatens the sustainable development of many regions, and exploring the spatio-temporal characteristics of land ecological security is helpful for analyzing the land eco-logical patterns between regions and over time. Based on the interpretation of remote sensing image data for Tian-jin in 1980, 2000, 2010 and 2019, supported by software such as ArcGIS and GeoDa, the changes of land use in the study area are calculated by using the land use dynamic degree. Then, the land ecological security index and spatial autocorrelation analysis methods are used to study the spatial correlations and internal heterogeneity of land ecological security in each district in Tianjin. The results show that: (1) The land use of Tianjin has changed dra-matically in the past 40 years: the building land has been expanding, while the farmland and barren have been shrinking continuously. (2) The overall level of land ecological security is in the high security area, and Jizhou Dis-trict is the highest, while the Central areas and Binhai are low. (3) The spatial heterogeneity of land ecological se-curity is not obvious, but the spatial agglomeration is strong.