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交试验设计法最初产生于20世纪20年代的英国，我国从上个世纪50年代开始此方面的研究。近年来，正交试验设计的方法开始引入化学实验教学，对优化化学实验教学起到了积极的作用。本期刊发一组运用此方法所做的中学化学实验改进，供老师们在教学中参考。 编 者
The cross-examination design method was first produced in the United Kingdom in the 1920s. Our country began this research in the 1950s. In recent years, the method of orthogonal experiment design has begun to introduce chemistry experiment teaching, which has played an active role in optimizing chemistry experiment teaching. This journal has issued a set of high school chemistry experiment improvements made using this method for reference by teachers in teaching. Editor