Abstract: The catalytic hydrogenalion of CO₂ over lanthana promoted and unpromoted Pd/SiO₂ was studied. The marked differences can be observed in catalytic activities of formation of methane and methanol.The turnover frequency of production of methane arid methanol are higher on lanthana promoted catalyst than that on unpro-moted one. These differences may be attributed to lanthana promotion effect by which the palladium particles may redispersed on the surface, meanwhile the function of the promoter probably create a number of basic active sites to modify the catalytic behavior of supported palladium catalysts on CO₂ hydrogenationreactions.