Ruthenium supported on rare earth oxides(REO)and the mixture ofrare earth oxides(MREO)was studied as heterogeneous catalyst in the 1-heptene hydroformylation under 5.0 MPa synthesis gas(CO/H_2)at 150℃ for20h.Of the rare earth oxides studied,most are better than Al_2O_3and CeO_2 isthe most efficient support.With MREO as support,the ruthenium content,solvents and pretreating condition were studied in 1-heptene hydroformylation.The results show that the best loading of ruthenium is 4% and non-polarcompounds such as cyclohexane,toluene are better solvents.Ru/MREO(3%)catalyst precarbonylated under 5.0 MPa synthesis gas(CO/H_2=1)at 150℃for 10h has high selectivity to aldehyde and low conversion of 1-heptene.TheFT-IR spectra of catalysts before and after reaction prove that rutheniumcarbonyls on the support surface are formed during the hydroformylation andthe precarbonylation processes,which are catalytic active,unstable anddecomposed during the reaction. Ruthenium supported on rare earth oxides (REO) and the mixture of earth dust oxides (MREO) was studied as heterogeneous catalyst in the 1-heptene hydroformylation under 5.0 MPa synthesis gas (CO / H 2) at 150 ℃ for20h.Of the rare earth oxides studied , most are better than Al 2 O 3 and CeO 2 is the most efficient support.With MREO as support, the ruthenium content, solvents and pretreating conditions were studied in 1-heptene hydroformylation.The results show that the best loading of ruthenium is 4% and non-polarcompounds such as cyclohexane, toluene are better solvents.Ru/MREO (3%) catalyst precarbonylated under 5.0 MPa synthesis gas (CO / H 2 = 1) at 150 ° C for 10h has high selectivity to aldehyde and low conversion of 1-heptene.The FT-IR spectra of catalysts before and after reaction prove that ruthenium carbonyls on the support surface are formed during the hydroformylation and the precarbonylation processes, which are catalytic active, unstable anddecomposed during the reaction.