本文介绍了惠勒延迟选择思想实验，并阐述其在量子力学教学中引入的必要性与挑战性.为便于本科生接受和理解，本文通过求解定态薛定谔方程给出了一维单δ势垒和双δ势垒对自由粒子散射过程的透射系数和反射系数，并进一步分析了该散射过程与马赫-曾德尔干涉的对应关系.最后本文以一维δ势垒散射为例，设计了一种延迟选择实验在量子力学课堂教学的引入方式，以期为波粒二象性教学提供新素材，为学生理解提供新思路.

The Wheeler's delayed-choice gedanken experiment is introduced, the necessity and challenge in the quantum mechanics teaching are discussed. In order to faciliate the acceptance and understanding for undergraduate students, by solving the time-independent Schrodinger equation, the reflectivity and transmissivity of the single and double δ potential scattering for free particles are obtained, the correspondence between the scattering and Mach-Zender interferometer is further discussed. Finally a way to introduce the delayed-choice experiment into the quantum mechanics class teaching is designed via the one-dimensional δ potential barrier scattering, in expectation to provide new materials and shed new light on the teaching and understanding of wave-particle duality.