Abstract: Functional finishing of cotton fabric was performed by the stable mineral HAP with a view to improving the photo-catalytic stability of cotton and its adsorption of TiO2;the key technologies for preparation of TiO2photo-catalytic functional material with cotton fabric as carrier were studied through orthogonal experiments.The results indicated that when the proportion of alcohol and water was 1∶1 in preparation of nano TiO2disperse system,the nanoparticles had the best dispersibility;and when the mass concentration of TiO2 was 3% in the disperse system,the prepared sample cotton fabric had optimum decomposability of formaldehyde under UV irradiation.