在pH=7.0的磷酸缓冲溶液中采用电沉积技术将咖啡酸修饰于玻碳电极表面制备了一层稳定的薄膜,该修饰电极制备简单,稳定性良好.用循环伏安法研究了抗坏血酸在修饰电极上的电化学行为,其氧化峰电流与抗坏血酸的浓度和pH值有关,当pH值达到7.7时,抗坏血酸在修饰电极上的氧化峰电流最大,氧化峰电流与抗坏血酸浓度在4.0×10-5～2.0×10-2mol/L范围成良好的线性关系,检测限为1.0×10-5mol/L,方法简单、快速、准确,可应用于抗坏血酸药片的检测. A stable thin film was prepared by electrodeposition of caffeic acid on the surface of glassy carbon electrode in pH = 7.0 phosphate buffer solution.The preparation of the modified electrode was simple and stable.Using cyclic voltammetry, Electrochemical behavior of the electrode, the oxidation peak current and ascorbic acid concentration and pH value of the pH value of 7.7, ascorbic acid oxidation peak current peak in the modified electrode, oxidation peak current and ascorbic acid concentration of 4.0 × 10-5 ~ 2.0 × 10-2mol / L, and the detection limit is 1.0 × 10-5mol / L. The method is simple, rapid and accurate and can be applied to the detection of ascorbate tablets.