Hydroformylation of 1-hexene on rhodium catalyst was studied under mild reaction conditions (P = 3.0 MPa, CO/H-2 = 1/1, T = 403 K). Its hydroformylation performances were investigated in a variety of solvent. It was found that the excellent activity for the heterogeneous catalyst was showed in the n-octane solvent, while poor activity in the alcoholic and H2O solvent.