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The ideal status of the GaAs photocathode bonding assembly is as fellows: the GaAs photocathode should not have additional stress; the crystal lattice should keep integrity after deposited Si 3 N 4 reflection reducing coating and bonging process that GaAs epitaxial material on a glass window. In order to estimating the bonding quality of the GaAs photocathode bonding assembly, integral photoluminescence intensity was calculated on the ideal bonding condition. Assuming the energy of incident light was absorbed by GaAs active layer except reflection, according to the optical character of the GaAs photocathode bonding assembly, the value was calculated. This value could be the standard to assess the quality of the GaAs photocathode bonding assembly and improve the bonding technology that the GaAs epitaxial material is bonded to a glass window.