In this work the copper electrode modified with thiourea was used for electrocatalytic oxidation of hydrazine in 0.1 M NaOH. The Modified electrode showed excellent character for electrocatalytic oxidation of hydrazine with decrease in overpotential and increase in the anodic current. The kinetic parameters such as the electron transfer coefficient (αa) and the catalytic rate constant (Kcat) for the oxidation of hydrazine were determined. The diffusion coefficient (D) of hydrazine in the solution was also calculated by chronoamperometry. The detection limit (3σ) was determined as 7.6 µmol L-1.