The hydrogenation of CO~2 over YBa~2Cu~3O~6~～~7 superconductor catalyst was investigated using XRD, in-situ FT-IR, XPS, ESR, TPR and AFM techniques. It is shown that the CH~3OH selectivity is directly proportional to the reaction pressure and space velocity, but is inversely proportional to the reaction temperature. The Cu^2^+ ions in YBa~2Cu~3O~6~～~7 were mainly reduced to Cu^+ in the presence of H~2 and CO~2. The intermediates in the catalytic reaction might be aldehyde and methoxy radical. During the hydrogenation the catalyst might be decomposed.

Key words: COPPER COMPOUNDS, BARIUM COMPOUND, YTTRIUM COMPOUNDS, METALLIC OXIDE CATALYST, SUPERCONDUCTING METERIALS, CATALYTIC ACTIVITY, SPECTROMETRIC ANALYSIS, METHANOL, HYDROGENATION, CARBON DIOXIDE