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研究了杂多酸阴离子α-P2W17O10-61 修饰电极的制备及其化学性质。α-P2W17O10-61修饰电极对Br O-3具有催化作用。催化电流ΔIp与［BrO-3］在 7.0×10-6～1.0×10 -4 mol/L范围内呈良好线性关系。用此电极测定了天然水中 BrO-3的含量，结果令人满意。“,”The preparation of α-P2W17O10- 61 film modified electrode is described. Different electrolyte pH or medium so lution and scanning potential range have strong influence on the characteristic of the electrode. The electrode has a catalytic effect on the reduction of broma te. The catalytic current and concentration of bromate show a good linearity in the range of 7.0×10-4～1.0×10-6 mol/L. The electrode had been appli ed to the determination of bromate.