本文介绍了单掺杂Mo6+及双掺杂Mo6+、Cr6+的溶胶-凝胶膜α－WO3的电致变色特性，实验结果与价间电荷跃迁理论所预言的复合膜透射率谱吸收峰移动规律一致，文章还采用晶体结构的离子配位场理论，解释了该复合膜是一种吸收型电致变色材料，其变色机理可归结为膜层中“小极子”跃迁而产生的光吸收． In this paper, the electrochromic properties of sol-gel films α-WO3 of single-doped Mo6 + and double-doped Mo6 + and Cr6 + are described. The experimental results agree well with the shift of the absorption peak of the composite membrane predicted by the valence charge transition theory , The article also uses the ionic ligand field theory of the crystal structure to explain that the composite film is an absorption type electrochromic material whose color changing mechanism can be attributed to the light absorption caused by the transition of “small polar body” in the film layer.