本书采用近代观点系统介绍了古典几何学的基础知识（其中包括欧氏几何、非欧几何、解析几何、球面几何与三角、射影几何等），并着重对各种古典几何体系进行比较分析和探讨，突出它们的几何思想和在方法论上的创见。

This book adopts a modern perspective to systematically introduce the basic knowledge of classical geometry (including Euclidean geometry, non Euclidean geometry, analytic geometry, spherical geometry and trigonometry, projective geometry, etc.), and focuses on comparative analysis and exploration of various classical geometric systems, highlighting their geometric ideas and methodological innovations.