微型化学实验的设计原理,必须充分体现“简”、“便”、“明”、“微”、“小”等特点。“简”是指装置简单;“便”是指操作方便;“明”是指现象明显;“微”是指用微型装置、微量试剂进行实验;“小”就是对环境污染小。基于微型实验的这些基本要求,笔者结合教育教学实践中的一些体会,谈谈医用废旧注射器在微型实验中的一些应用。 The design principles of micro-chemical experiments must fully reflect the characteristics of “simple,” “gentle,” “bright,” “micro,” and “small.” “Jane” means simple device; “Jie” means easy operation; “Ming” means obvious phenomenon; “Micro” means experiment with micro devices and trace reagents; “Small” means little pollution to the environment. Based on these basic requirements of micro experiments, the author combines some experiences in education and teaching practice to talk about some applications of medical old syringes in micro experiments.