用微分脉冲极谱法研究了烷基紫精及聚紫精的电氧化还原行为。紫精的烷基影响紫精化合物的还原电位及其还原产物在电极上的成膜性能。与低分子烷基紫精相比，烷基聚紫精的第一还原电位Ｅ＿１较正，两步还原反应的电位间隔△Ｅ较大，而且两步还原反应均有良好的可逆性。支持电解质的卤素负离子对紫精化合物的还原电位有影响，其影响能力的顺序为：Ｉ￣－＞Ｂｒ￣－＞Ｃｌ￣－＞Ｆ￣－。 Electrooxidation and reduction behavior of alkyl viologen and concentrate violet were studied by differential pulse polarography. The alkylation of viologen affects the reduction potential of the viologen compound and the film-forming properties of the reduced product on the electrode. Compared with the low molecular weight alkyl-viologen, the first reduction potential E_1 of the alkyl-poloxamer is more positive and the potential interval △ E of the two-step reduction is larger, and the two-step reduction reaction has good reversibility. Halogen anions supporting electrolytes have an effect on the reduction potential of the viologen compounds, and the order of their influence is: I-> Br-> Cl-> F--.