针对金属反射相移计算时电磁波相位符号表述混乱导致错误的穿透深度计算结果现象，通过理论推导得出电磁波两种相位表述符号下对应的金属复折射率有两种不同形式，从而导致金属反射相移位于不同的象限，穿透深度和反射相移之间的关系式也相应的有两种结论.并通过调节Ag膜的厚度制作了一系列对称全金属λ/2腔器件，器件结构为Glass/Ag/LiF/Ag.通过比较Ag膜穿透深度的实验结果和计算值，验证了其中一种金属穿透深度公式的正确性.

In order to solve the error result of the penetration depth that was caused by confused sign convention for the phase factor of electromagnetic sinusoidal waves,inconsistency was found in the expression of the phase shift and the relation of the phase shift and the penetration depth .The results on the phase shift and penetration depth of metal mirror in microcavities were reported.A series of λ/2 cavities with the symmetrical structure of Glass/Ag/LiF/Ag was made by changing the thickness of Ag film.The penetration depths at different thickness of Ag film were obtained from the transmittance peaks of the cavities.Phase shift upon reflection at LiF-Ag interface was calculated based on the measured optical constants.The formulation between phase shift and penetration depth was proved by the experimental results,which are in good agreement with the theoretical calculations.