Abstract: Two kinds of titanium-containing mesoporous molecular sieves Ti-MSU-1 and Ti-MSU-2 were synthesized by using nonionic surfactants C₁₈(EO)₁₀ or C₁₂Ph(EO)₁₀ as templates respectively, TEOS as silicate source, TBOT as titanium source, ethanol and isopropanol as cosolvents.Structures of the synthesized molecular sieves were measured and characterized by XRD, FT-IR, UV-Vis, elemental analysis and N₂ absorption-desorption methods. Hydrothermal treatment in an autoclave of the molecular sieves precursor could help to enhance the symmetry and the ordered degree of the mesoporous structures of Ti-MSU-1 molecular sieve.However, the same method could not modify the mesoporous structures of Ti-MSU-2 molecular sieves remarkably.Both Ti-MSU-1 and Ti-MSU-2 molecular sieves showed catalytic activity to oxidation reaction of styrene.Conversion of styrene increased with increases of Ti content in the molecular sieves framework.Catalytic oxidation performance of Ti-MSU-1 was comparable to that of Ti-MSU-2, which corresponded to similar pore structures.