尺寸是工程图样的重要组成部分,是零件生产加工、装配调试与质量控制的重要依据。“尺寸标注”内容实践性强,涉及面广。对于教与学双方,都有一定难度。文章从尺寸标注的正确、完整、清晰、合理的四项基本要求深入分析教材内容和教法改革,依据教学实践总结有效方法。 Size is an important part of engineering drawings, parts production and processing, assembly and commissioning of an important basis for quality control. “Dimension ” content practical, involving a wide range. For both teaching and learning, there is a certain degree of difficulty. The article deeply analyzes the content of teaching materials and the reform of teaching methods from the four basic requirements of correctness, completeness, clarity and rationality of dimensioning and summarizes the effective methods according to the teaching practice.