Electrochromic devices (ECDs) based on WO3 and Ti doped V2O5 films are fabricated by using lithium (LiClO4) liquid electrolyte containing ferrocene redox couple. The addition of ferrocene in electrolyte enhances electrochromic properties of device. The device based on LiClO4-Ferrocene electrolyte has larger charge density than that based on LiClO4 electrolyte. In the 600-1500 nm wavelength range, the transmittance of colored device is under 2% and it has faster coloring response. At 680 nm wavelength, it shows larger changes in transmittance from 68% to 1.8% while device based on LiClO4 electrolyte changes transmittance from 68.3% to 11.5%. The cycling data reveal that device based on LiClO4-Ferrocene electrolyte can yield more stable electrochromic properties at 65 degrees C than room temperature. In order to deeper understand the effect of electrolyte on films and devices, electrochemical impedance spectroscopy (EIS) and the voltage distribution of films based on an analog cell are separately measured and analyzed in LiClO4 and LiClO4-Ferrocene electrolytes. Results indicate that compared with LiClO4 electrolyte, films have lower charge-transfer resistance and the distributed voltage on Ti doped V2O5 film is larger in LiClO4-Ferrocene electrolyte, which can enhance optical properties of ECD by improving charge density of Ti doped V2O3 film.