Tungsten oxide (WO_3-x) thin films were fabricated by reactive magnetron sputtering at glancing angle α=0° or α=80°, and then titanium oxide (TiO₂) was deposited on it. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and X-ray photoelectron spectroscopy (XPS) were employed to characterize the crystal structure, surface/cross-section morphologies, and surface chemical composition of the WO_3-x/TiO₂ thin films. Electrochromic properties of the WO_3-x/TiO₂ thin films were measured by electrochemical workstation in three-electrode system with 1 mol/L LiClO₄/PC solution and UV-Vis spectrophotometer. Results reveal that the WO_3-x/TiO₂ thin films present totally amorphous structure independent on glancing angles. As the glancing angle is kept at 80°, the nano-columnar porous thin film is obtained. Substoichiometric tungsten oxide (WO_3-x) and stoichiometric titanium oxide (TiO₂) are confirmed by XPS spectra of W 4f and Ti 2p, respectively. Compared with the dense thin film, the nano-columnar porous film needs a lower driving potential and presents faster response. The charge capacity of the nano-columnar porous film is calculated to be 83.78 mC, which is over twice higher than 30.83 mC of the dense film. The intercalation and deintercalation ion diffusion rates are determined to be D_in=5.69×10^-10 cm²·s^-1 and D_de=5.08×10^-10 cm²·s^-1 at the applied potential ±1.2 V, respectively. The electrochromic cycle of the nano-columnar porous WO_3-x/TiO₂ thin film is more stable than that of pure WO₃ thin film. The optical density varying (ΔOD) of the nano-columnar porous thin film is larger than that of the dense thin film due to the larger optical modulation amplitude in the whole visible wavelengths.