"The intersection line of the cylinder", a key but diffi-cult content faced by students beginning the learning of "Me-chanical Drawing", has a great influence on the learning of sub-sequent contents. In accordance with the writer's many years' teaching experience, the writer adopts teaching models and mul-timedia tools, properly designs teaching contents, and employs diverse teaching methods, and has achieved impressive teaching effect.%“圆柱的截交线”是学生“机械制图”课程学习初开始碰到的一个重难点的内容，对于后续内容的学习影响较大。笔者根据多年教学经验，采用教学模型和多媒体辅助，合理设计教学内容，采用多种不同教学方法，教学效果良好。
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