The invention discloses a method for preparing solid phases of gamma-Al2O3 carriers with high specific surface areas.Solid-phase reaction is carried out on aluminum salt and additives at the room temperature on the premise that optional solvents are omitted, and then reaction products are roasted to obtain Al2O3.The method includes steps of (1), weighing certain quantities of the aluminum salt and the additives, mixing the aluminum salt and the additives to obtain solid mixtures and grinding the solid mixtures; (2), directly roasting the solid mixtures in air atmosphere to obtain the aluminum oxide carrier.The method has the advantages that the method is easy to implement, short in preparation cycle and high in synthesis efficiency, the optional solvents are omitted, and reaction procedures are easy to control; the aluminum oxide carriers prepared by the aid of the method have the high specific surface areas and large pore volumes and are applicable to hydrotreatment on catalysts.