A new kind of Mirco/mesoporous Composite N-doped TiO2was synthesized with alkali treatment of 13X molecular sieve, sodium silicate as raw materials, adding organic template and Ti[O(CH2)3CH3]4, then introducing the nitrogen source under hydrothermal condition. Many techniques such as XRD, TEM, N2adsorption-desorption were used to characterize the microstructure of the composite material. The degradation experiments of Di-n-butyl phthalate (DBP) were carried out to test the catalytic activity of the composite material and optimize the experimental conditions such as Si/Al (molar ratio), pH value, N/Ti (molar ratio), crystal duration and calcination temperature．The results indicate that the N-doping can make the light absorption of the photocatalyst obviously extended into visible-light region,and increase the visible-light photocatalytic activity.