The SnO2：(Cu，In) thin films are deposited on glass substrates by reaction evaporation. The photoluminecence(PL) of the films is researched. The films have amorphous structure. The transmittance is measured in the range 220—1100nm. The width of optical band gap is Eoptg=4.645eV. At room temperature，the photoluminescence is measured at different wavelengths，and continuous spectrum of photoluminescence is obtained in the range of 276—550nm. Especially，the density distributing in band tail states is determined by analyzing the emission spectrum.