We developed a process for preparing SiO2/TiO2 fibers by means of precursor transformation method. After mixing PCS and titanium alkoxide, continuous SiO2/TiO2 fibers were fabricated by the thermal decomposition of titanium-modified PCS (PTC) precursor. The tensile strength and diameter of SiO2/TiO2 fibers are 2.0 GPa, 13 mu m, respectively. Based on X-ray diffraction (XRD), scanning electron microscopy (SEM), and high resolution transmission electron microscopy (HRTEM) measurements, the microstructure of the SiO2/TiO2 fibers is described as anatase-TiO2 nanocrystallites with the mean size of similar to 10 nm embedded in an amorphous silica continuous phase.