As an important semiconductor material,titanium oxide (TiO₂) can be us ed in many fields.The sol-gel spin coating method was used to provide titanium sourc e and silver nitrate (AgNO₃) to provide silver source with butyl titanate (Ti(OC₄H₉)₄) respectively.The intrinsic and Ag doped TiO_2films were prepared.The structure,surface morpholo gy and optical properties of the samples were analyzed and characterized by X-ray diff raction (XRD), scanning electron microscopy (SEM) and ultraviolet visible spectrophotometer (UV -Vis).The results show that all the samples are anatase and grow preferentially along the (101) crystal plane.Compared with the intrinsic TiO₂,the doping of Ag⁺ does not change the peak position of diffraction peak or appear impurity peak,the grain size of the samples is re latively reduced, the spacing between crystal planes and half height width are increased;the surf ace of the samples is modified,the defects are reduced,and the arrangement between grains is more orderly;the absorption edge of the sample is red shifted,and the band gap ener gy is reduced. The results show that the (101) diffraction peak is the sharpest,the grain size is the smallest, the pores between the films are the least,and the band gap is 3.476eV.