The influences of sugars (sucrose, fructose and glucose) on the performance of FeAl catalysts were investigated for CO₂ hydrogenation. FeAl catalysts were prepared with two steps. At first, the catalyst precursors were obtained by co-precipitation. During this step, three methods were used to add sucrose intothe precursors. Then, promoter K and Cu were impregnated into the precursors. The improved CO₂ conversion and C₅₊ hydrocarbon selectivity by sucrose addition were attributed to the formation of c-Fe₂O₃ phase in the catalyst precursor, which was different from the popular opinion that sucrose acted as a chelating agent. With the inspiration from sucrose hydrolysis effect, FeAl oxide, mainly in c-Fe₂O₃ phase was prepared by adding fructose and glucose (the products of sucrose hydrolysis) into the newly centrifuged precipitate.The formation of c-Fe₂O₃ phase was explained based on the results of XRD and XPS. The best catalyst possessed CO₂ conversion of 30.3% and C₅₊ selectivity of 52.2% under the reaction conditions of H₂-:CO₂ = 3:1, 6.0 L/(h.g-cat), 1.6 MPa and 235 ^°C.