In this study, we synthesed two kind of $TiO_2$ nanomaterial (nanoparticles and nanofiber) for photocatalitic degradation of methyl orange (MO) as pollutant. $TiO_2$ nanoparticles were synthesized by sol-gel technique using titanium (IV) isopropoxide as precursor. Polyvinyl acetate (PVAc)/$TiO_2$ hybrid nanofibers were fabricated by combining sol-gel process with electrospinning technology, which consisted of PVAc as organic segment and $TiO_2$ as inorganic part. Crystalline phase of $TiO_2$ nanomaterials was investigated by X-ray diffraction (XRD). The XRD results show that the $TiO_2$ nanomaterials crystallize in anatase with some rutile phase and these consist of titanium dioxide nano-crystals. The surface structures of $TiO_2$ nanomaterials were examined using scanning electron microscopy (SEM). SEM scanning revealed that the nanoparticle and nanofibrous structure was formed. Fourier transform infrared spectroscopy (FTIR) was employed to analyze the chemical structures of the PVAc/$TiO_2$ hybrid nanofibers. The FTIR analysis indicated the newly formed associated hydrogen bond because of the hybrid effect between PVAc and $TiO_2$ sol. Finally, The photooxidative decomposition of methylene blue by using the titania nanomaterials was examined and compared.