“假设法”是科学研究中常用的一种思维方法,也是化学学科解题中常用的技巧和策略之一。笔者试从氧化还原反应方程式的配平、与量有关的离子方程式的书写、与多种物质反应时先后顺序的判断、化学常规计算、有关混合物的计算和有效实验探索等几个方面来探讨“假设法”在化学中的应用。 “Assumption Law” is a commonly used method of thinking in scientific research, and is also one of the commonly used techniques and strategies in solving chemical problems. I try to balance the redox reaction equation, and the amount of the ion equation writing, with a variety of substances in the order of judgment, chemical routine calculations, the calculation of the mixture and effective experimental exploration and other aspects to explore Hypothetical Law "in Chemistry.