The all-solid lithiated electrochromic device for transmissive light control is described in this paper. This device comprises of a WO$-3$/ film and a mLiF:nAlF$-3$/ layer sandwiched by a pair of electrconductive layers. The transmittance of the device can be arbitrarily controlled within the range from 50% to 10%. The response time is 30 sec. for coloring and 40 sec. for bleaching, which is affected by the resistivity of ITO film and diffusion rate of Li$+$PLU$/. The effects of substrate temperature and heat treatment on the properties of WO$-3$/ films are discussed.
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