Abstarct: The low-emissivity (low-E) coatings are multiple ultra thin laxyers on glass used for producing spectrally selective glazing. The use of low-E glazing in building windows makes possible to limit the radiative heat transfer without reducing the visible transmittance perceptibly and accordingly altering the necessary natural lighting in the low energy buildings. In this thesis, ZnO/Ag/ZnO thin films are deposited on glass substrate via RF and DC sputtering by ZnO and Ag targets respectively, in various deposition time of ZnO and Ag laxyers. The NIR reflectance is advanced by using a feasible and affordable method with a low number of ultra thin laxyers and by reducing the cost of the vacuum. Presented results are related to electrical, optical and thermal properties for multi-laxyers baxsed on sandwiched Ag by ZnO in diverse deposition time at room temperature. The electrical and optical properties of the single and double Low-E coatings are investigated as a function of Ag deposition time, too. The goal of this work is to highlight the correlation between the Ag and ZnO ultra thin films in multi-laxyers and the resulting properties, in order to advance low emissivity solutions with high ratio of visible transmittance to solar transmittance, high NIR reflectance and low glazing system U-value.