Abstarct: Smart windows are devices that changes color in a persistent but reversible manner by an electrochemical reaction. 〖WO〗_3 and NiO are good candidates for smart windows aplications because of high color efficiency , different transmittsnce and their fast response time. In this thesis we have studied the morphological, structural , optical and electrochromic properties of industrial tungsten oxide (〖WO〗_3) samples grown by electrodeposition and sol gel methods and pure nickel oxide (〖WO〗_3) samples grown by chemical bath deposition method. Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV-Vis spectroscopy and cyclic voltammetry (CV) have been employed for their caractrization. mextal tungsten powder, H_2 O_2 and deionized water have been used for syntesize of 〖WO〗_3 by electrodeposition method. In this method, some parameters such as annealing temperature (65-100-250 and 400 ° C), time of deposition (420-600-660 and 720 min ), aging of precsesore (0 - 24 - 48 and 72 h) and finally the effect annealing under oxygen flow have been used for optimizing the end samples. nickel solfate powder (99%), potassium per solfate (98%) and ammonia (25%), have been used for synthesize of NiO by chemical bath deposition method. In this method a parameter such as time of deposition (10-20-30-40 and 50 s) have been used for optimizing the end samples. FESEM imtages exhibit the formation of cracks and nano flack and the XRD patterns indicate that confirm the amorphous phases in WO3 samples. Transmission spectra of the samples indicate that difference transmittance in bleached and colored states and cyclic voltammetry of the samples indicate that charge capacity and reversibility velocity. NiO sample grown by chemical bath deposition method deposited after 50 min shows optimum conditions for transmittsnce, color efficiency and response time.