Abstract: TiO₂ has attracted intensive attention owning to its nontoxicity, low cost, super-hydrophilicity, long-term chemical stability and high photocatalytic activity. Various synthetic strategies for this important semiconductor have been attempted so far, usually using titanium (Ⅲ/Ⅳ) halide or alkoxide compounds as the titanium source. In this paper, urchin-like TiO₂/TiSi₂ composite was developed by a facile one-pot hydrothermal method, using TiSi₂ and HCl as the Ti precursor and morphology control agent respectively. The hydrothermal reaction was performed by using polytetrafluoroethylene(PTFE)-lined stainless steel autoclave as reactor in an oven and kept at 180℃ for 18 h. The as-prepared samples were characterized systematically by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscope (XPS) and UV-visible absorption spectra (UV-vis). Results indicated that the urchin-like TiO₂ assembled by nanorods grown on TiSi₂ substrate was confirmed to grow along001 orientation and exhibited uniform size and smooth surfaces. In addition, the tips of TiO₂ nanorods presented pyramid tetrahedron shape and could convert to cone shape with increasing the concentration of HCl aqueous solution. Furthermore, compared with pure rutile TiO₂, TiO₂/TiSi₂ composite showed a higher absorption in visible light. Thus, the significant enhanced photodegradation efficiency of the organic pollutants with the TiO₂/TiSi₂ composite under visible light irradiation was obtained. The photodegradation rates of methyl orange were measured which confirmed the highest performance of the TiO₂/TiSi₂ composite in comparison to pure rutile TiO₂ and TiSi₂.