Graphene modified platinum electrode was prepared,and the electrochremical behaviors of dopamine was studied on the bare and modified platinum electrode. Furthermore, the impact of glycine on dopamine was studied with the two kinds of working electrodes. Experimental results show that glycine can hinder the oxidation of dopamine through weakening the electron-donating ability of dopamine by some means in the electrolyte. And the interaction behaves as that glycine can decrease the oxidation and reduction current sharply and increase the gap between oxidation potential and reduction potential. The graphene modified electrode has excellent catalytic properties for redox of dopamine.%制备了石墨烯修饰铂电极，研究了多巴胺在裸铂电极和修饰铂电极上的电化学行为，并且进一步研究了电解液中存在的甘氨酸对多巴胺电化学行为的影响。实验结果表明，电解液中的甘氨酸会减弱多巴胺的给电子能力，抑制其发生氧化，这种作用主要体现为氧化还原电流明显减小和氧化还原电位差稍有增大。石墨烯修饰铂电极对多巴胺有明显的催化作用。
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