Nanosized MCM-41 molecular sieve was prepared by using cetyltrimethylammonium bromide (CTMAB) and tetraethyl orthosilicate (TEOS) as the template and the silica source by means of hydrothermal method. The titanium-nano MCM-41 composite materials were prepared by impregnating the calcined nanoscale MCM-41 molecular sieve and using the tetrabutyl titanate as the titanium precusor. By means of powder X-ray diffraction, chemical analysis, nitrogen adsorption-desorption technique, infrared spectroscopy, the efficiency of the preparative method and the effect of it on the pore structure of nanometer MCM-41 molecular sieve were evaluated. The results show that titanium is incorporated into the MCM-41 molecular sieve. The silanol groups on the internal wall surfaces of MCM-41 are suggested to be the major sites for titanium incorporation. A part of titanium is in the channels of the molecular sieve. The prepared Ti-(nano MCM-41) materials keep the highly ordered mesoporous one-dimensional structure. The significant blue shift of the UV-vis diffusion reflectance absorption spectra of the Ti-(nano MCM-41) sample, compared to the spectrum of bluk TiO2, results from the encapsulation of titaniun dioxide particales in the channels of nanosized MCM-41 molecular sieve.