TiO_2 nanospheres were successfully prepared by liquid-liquid interface reaction. The samples were characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM) and UV-vis spectroscopy. Besides,the photocatalytic degradation of methylene blue was investigated. The results showed that the purity of TiO_2 prepared by liquid-liquid interface reaction is high. The particle morphology of the sample is regular spherical,and the particle size is regular,which the diameter is 150 nm approximately. The photocatalytic degradation rate of methyle...