该文根据多碱光电阴极光学信息和光电流监控原理，给出了理论模型，研制了测试仪器，例举了测量结果，并对此作了简单分析。理论的多碱光电阴极光学反射率Ｒ（ｄ）和实测的Ｒ（ｄ）比较可以控制阴极成分，并给出阴极厚度的信息、多碱光电阴极的单色光电流Ｉ（ｄ）、光电子逸出深度以及大量的工艺信息，借此可以调整工艺，改善光电阴极的光谱响应。 Based on the principle of multi-alkali photocathode optical information and photocurrent monitoring, this paper presents a theoretical model, a test instrument, an example of the measurement results, and a simple analysis of this. The theoretical multi-alkali photocathode optical reflectance, R (d), can be compared with the measured R (d) to control the composition of the cathode and gives information on the thickness of the cathode. The monochromatic photocurrent I (d) Depth and a large number of process information, which can adjust the process to improve the spectral response of the photocathode.