All oxide solid state ITO (indium tin oxide)/LiyWO3-x,/Li1-zMn2O4/ITO stacked structure was deposited on a silica glass substrate by pulsed laser deposition for its electrocbromic application. The Li doped amorphous tungsten trioxide LiyWO3-x, thin film prepared at room temperature and in oxygen pressure of 7Pa got the color of blue due to the mixture valence state of tungsten. We found that the amorphous Li1-zMn2O4 thin film was suitable for the electrochromic application in spite of the low ion conductivity along in-plane direction. The ITO electrode thin film deposited at room temperature showed the relatively high transmittance and the usable conductivity. The transmittance at a wavelength of 750nm for the ITO/LiyWO3-x/Li1-zMn2O4/ITO stacked film changed from 50% to 80% by the applied voltage, while the transmittance at around 450nm did not change. The blue-colored electrochromic property could be observed for the all oxide solid state film. (c) 2006 Elsevier B.V All rights reserved.