The making process of K2Te(Cs) solar blind ultraviolet cathode was described and samples of K2Te(Cs) solar blind ultraviolet cathode were made. The spectral response, spectral reflectance and fluorescence spectra under the excitation condition of 250 nm wavelength about K2Te(Cs) and Cs2Te solar blind ultraviolet cathodes were measured. The measuring results showed that under the existing technological condition, the spectral response of K2Te(Cs) solar blind ultraviolet cathode is higher, the peak wavelength of spectral response is shorter than that of Cs2Te solar blind ultraviolet cathode. However, their long wavelength thresholds of both cathodes were basically same. The peak wavelength of spectral response of K2Te(Cs) cathode is about 250 nm, long wavelength threshold is about 336 nm. In addition, K2Te(Cs) solar blind ultraviolet cathode has better solar blind property; the spectral sensitivity at 633 nm is ranked at the order of magnitude of 10－4 mA/W, one order of magnitudes lower than that of Cs2Te solar blind ultraviolet cathode. As for the spectral reflectance, the measuring results showed that the spectral reflectance of K2Te(Cs) solar blind ultraviolet cathode is higher than that of Cs2Te solar blind ultraviolet cathode within the scope of 200~437 nm wavelength, however is basically same as that of Cs2Te solar blind ultraviolet cathode within the scope of 437~600 nm wavelength, the refractive index and extinction coefficient of K2Te(Cs) solar blind ultraviolet cathode are less than that of Cs2Te solar blind ultraviolet cathodeThe measuring results on fluorescence spectra indicated that under the same condition and within the scope of 250~350 nm wavelength, the fluorescence of K2Te(Cs) ultraviolet cathode is stronger than that of Cs2Te ultraviolet cathode, the more strongly the fluorescence, the more transition electrons and the higher spectral response of cathode. The properties of K2Te(Cs) solar blind ultraviolet cathode are better than that of Cs2Te solar blind ultraviolet cathode, and thus can be applied to image device for solar blind ultraviolet detection as well.