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Ceramic samples of copper oxide were synthesized and their microstructure, elemental composition and electrical properties were investigated before and after the influence of YAG:Nd laser radiation. It was discovered that laser radiation leads to the fusion of granules and to a decrease in oxygen concentration in the surface layer of the sample. After the laser treatment the electrical properties of the samples pre-coated and not coated with copper film differ significantly, in particular the resistive thermal activation energy of these samples differs several times. For all the samples the current-voltage characteristics were linear at small values of the current.