Abstarct: In this research work we have studied the morphological, structural, optical, electrical and thermo-electrical properties and also electrochromic application of tungsten oxide (WO3) laxyers grown on glass substrate by spray pyrolysis method. We then characterized our samples using field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV-Vis-NIR spectroscopy, current-voltage (I-V) measurement and Seebeck effect experiment. In the grown samples we have used ammonium tungstate ((NH4).2WO4) solutions, using tungstate oxide powder (WO3) (99.9 %), and ammonia solution (NH3). In fabrication of WO3 laxyers various parameters were investigated. These are including: volume of the solution, annealing the samples in the air atmosphere, substrate temperature, substrate type and finally the doping effect with Li (WO3: Li) atoms, using lithium chloride salt (LiCl). In these samples the FESEM images indicate the formation of compact strings and nano particles on the surface. Also athe X-ray diffraction spectra show the formation of samples in amorphous and polycrystalline phase structures. Transmission spectra of the laxyers indicate the transparency of the samples in the visible region. I-V characteristic of the films show all laxyers have high resistance at room temperature. Finally the Seebeck effect proves that all samples have n-type conductivity.