缩口力是导致薄壁筒形件缩口失稳的重要因素。为了提高缩口力的计算精度，M·B·斯德洛日夫和E·π·翁克索夫综合考虑板厚变化、加工硬化及磨擦等因素的影响，分别提出了圆筒形件缩口力的计算方法；通过实例对该两种方法的计算结果进行了分析，并与实验数据做了比较。结果表明，两种方法的计算结果十分接近，而且与实验数据相吻合。

Necking force is the main failure factor to the unstabitily of the thin-wall cylindrical parts. In order to improve the calculation precision of the necking force , Сторожев and Унксов separately put forward two different calculation methods about the necking force of the thin-wall cylindrical parts which take into consideation the thickness changing, the hardening effect and the friction function. In this paper, the results of the two calculation methods are analyzed by example,and are compared with experimented data. The results of two calculation methods are close to each other, and tally with experimented data.