TiO2 nanotube arrays were prepared by anodization and a high potential(140 V)was immediately exerted at the end of anodization to obtain both-side-open nanotube arrays(see Fig.1).To improve the dispersion of Ag + nanoparticles in TiO2 nanotube arrays,the loading of Ag was executed by wet imprenation under a centrifugal field,then excess formaldehyde solution was added to reduce Ag + under stirring.The performance of as-prepared both-side-open Ag/TiNTA catalyst was tested in the oxidation of formaldehyde in water under ambient conditions.The result showed that 40%formaldehyde(20ml,0.16ug/ml)was reduced by 0.05g as-prepared catalyst in 1h,which is better than 25%by conviental Ag/TiNTA catalyst.The better activity might be attributed to the better dispersion of Ag in the nanotube arrays and the enhanced transfer of formaldehyde to active sites.