Abstract: Reduced graphene oxide was prepared by using electrochemical reduction method. The morphology and structure of as-synthesized reduced graphene oxide were characterized using field emitting scanning electron microscopy, Raman spectroscopy, and atomic force microscope. The electrochemical properties of reduced graphene oxide were studied by cyclic voltammetry (CVs). The electrocatalytic activity of reduced graphene oxide toward N₂H₄·H₂O was investigated by using CVs and amperometric i-t curve. Experimental results demonstrated that reduced graphene oxide showed enhanced electrocatalytic activity towards the oxidation of hydrazine. The improved catalytic performance may be ascribed to the excellent electron conductive capability of reduced graphene oxide. The oxidation peak current of N₂H₄·H₂O was linear against the concentrations of N₂H₄·H₂O ranging from 1×10^-5~1×10^-4 mol/L. The sensitive detection of N₂H₄·H₂O could sucessfully be performed on reduced graphene oxide modified eletrode. This study work was expected to promote the application of graphene' composite.