Some samples of alumina supporting with sulfate ions and molybdenium were prepared by impregnation method. Supported samples were calcinated at 550°C for 6h. Presence of sulfate ions and molybdenium lead to decreasing of the specific surface area of alumina, and in the ease of molybdenium the decreasing value was higher. The total pore volume was decreased with the pore size was increased. XRD patterns showed that the incorporation of sulfate ions and molybdenium did not affect crystalin structure of alumina. FTIR spectra showed the bonding between sulfate ionsmolybdenium and alumina. The TG-DTA studies showed that the losses mass was decreased when the sulfate ions and molybdenium were incorporated, sulfate ions and molybdenium oxide decomposed at ~700°C and ~800°C respectively .