The quantum yield formula for uniform-doping GaAIAs/GaAs transmission-mode photocathodes is revised by taking into account the light absorption in the window layer.By using the revised quantum yield formula, the domestic and ITTs experimental quantum yield curves are fitted and the fitted curves match well with the experimental curves.In addition, the fit results show that the integral sensitivity and quantum yield of domestic image intensifier tube has achieved 2130μA/lm and 45%, nearly reaching ITTs third generation level in 2002,whereas the discrepancy in cathode performance is mainly embodied in the electron diffusion length and back interface recombination velocity.