尺度作为地理事象与历史事件在时间和空间上的量度，是地理与历史交叉融合的核心，尺度思想亦是中学生必须掌握的地理学基本思想之一。本文以“生态安全”为例，构建了尺度思想下地理与历史跨学科教学的实施路径，以指导学生认识不同时期的人地关系，进而树立生态安全观，发展地理学科核心素养。

Scale, as the measurement of geographical phenomena and historical events in time and space, is the core of the cross-integration of geography and history. The scale thought is also one of the basic geographical ideas that middle school students must master. This article takes "ecological security" as an example, constructs the implementation path of interdisciplinary teaching of geography and history under the scale thought, in order to guide students to understand the human-land relationship in different periods, and thereby establish an ecological security view and cultivate students' geographic key competency.