在建筑专业画法几何课程教学中，3D建模的引入使学生学习路径加长，教学任务量也随之增加，但同时也会丰富教学内容并对固有的教学内容起到有效促进作用。Google SketchUp使用简便、扩展性强、使用成本低。基于这些特点，通过辅助投影教学、创建虚拟校园等分析了在建筑专业画法几何课程中利用Google SketchUp进行教学辅助和开展互动教学的过程。实践表明，合理利用Google SketchUp能有效加强画法几何课程教学效果，提高教学效率并充分调动学生的积极性，提升学生团队协作和动手能力。

When 3D modeling are involved in descriptive geometry course teaching of civil engineering, students' learning path are extended. Although the teaching task is increased, teaching contents are enriched. Compared to other modeling tools, Google SketchUp is simple to use, expandable and low-cost. Based on the features, applying Google SketchUp in teaching and interactive teaching of descriptive geometry course by case studies was analyzed. The practice shows that reasonable use of Google SketchUp can effectively strengthen descriptive geometry course teaching effect, improve teaching efficiency, fully mobilize students' enthusiasm in participating in teaching interaction, and improve students' practical ability and the team cooperation.