Abstarct: In this research work we have studied the morphological, structural, optical, electrical and thermo-electrical properties of pure and doped tungsten oxide (WO3) laxyers grown on glass and FTO substrate by spray pyrolysis method. For sample characterization we have field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV-Vis-NIR spectroscopy, current-voltage (I-V) measurement and Seebeck effect experiment. The grown samples are prepared using ammonium tungstate ((NH4)2WO4) solutions, using tungstate oxide powder (WO3) (99.9%), and ammonia solution (NH3). In work various parameters were investigated, including: volume of the solution, substrate (glass and FTO), annealin (in air and N2 gas atmospheres), doping with Li atoms (WO3:Li) and N2 (WO3:N) atoms, using lithium choloride salt (LiCl) and N-N-Dimethylformamid (CHON(CH3)2) solution, respectively. The FESEM image of the samples indicated the formation of the tungsten oxide nano strings and particles on the studied substrates. The XRD spectra revealed the amorphous nature of the laxyers and polycrystalline after annealing process. The optical transmittance spectra of the laxyers showed all are transparent in the visible region. The electrical I-V characteristic showed all samples have a relatively high sheet resistance (~ 1 GΩ) at room temperature. Finally the Seebeck effect experiment showed all samples have n-type conductivity.