In order to compare the different contributions of two noble metals (A u and Pt) in improving the photoelectric performance of TiO_2nanotube (TNT) ar ra y thin films,Au or Pt nanoparticles modified TNT array films were prepared by t he latter doping method and the pre-doping method in the experiment,respective l y.The films are individually named TNT-Au and TNT-Pt,Au/TNT and Pt/TNT.Thro ug h testing the P-V characteristic curves and photocataly tic degradation behavior of the samples,it is found that no matter which method is adopted,the photoele ctric performance of all precious metal doped TNT array films has been improved. Compared with pure TNT array film,the photoelectric conversion efficiency of T NT-Pt film is the highest,about 35times; the photocatalytic activity of TNT- Au film is the highest,about 2times.It is also observed that for photoelectric conversion efficiency,TNT-Pt film is about 10times of TNT-Au film,and Pt/TN T film is about 2.9times of Au/TNT film; for photocatalytic degradation rate, TNT -Au film is about 1.5times of TNT-Pt film, Au/TNT film is about 1.2times of Pt /TNT film.So it can be summarized that Pt nanoparticles are more conducive to e nhance the photoelectric conversion efficiency of TNT array films than Au nanopa rticles,while Au nanoparticles are more beneficial to improve the photocatalyti c activity of TNT array films than Pt nanoparticles.