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The CuxO/TiO2 nanotubes arrays are fabricated in two stages. Firstly, TiO2-NTs are grown by the Ti-foil anodization process and then annealed for 2h at 500 ℃. Subsequently, CuxO thin film was deposited with different deposition times on the nanotubes by electrochemical cathodic reaction, then heated twice, once at 200 ℃ in the air and then at 300 ℃ in the closed furnace for 2 h, respectively. Pure-TNT and CuxO/TNTs heterostructure are characterized by XRD, FE-SEM, EDX, Hall effect, and as a gas sensor. Results show that the gas sensor (CuOx=1/TiO2 for NO2 and H2 gases) prepared at the time (1 min) is higher than the pure TiO2-NTs and also higher than Cux=2O/TiO2 which were synthesized at various times 3, 5, 7, and 10 mins.