The controllable stannic oxide nanoflowers had been synthesized by hydro-thermal method through changing synthesized reagent and temperature, in this paper. Then the structure and micromorphology were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Finally, the photocatalytic degradation ability of prepared products was studied by ultraviolet absorption method. The results showed that the prepared products were pure stannic oxide crystals with rutile structure, micromorphology of flower, good dispersibility, uniform size and strong photocatalytic degradation ability. [ABSTRACT FROM AUTHOR]