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A Fe(CN)6 4. doped polypyrrole composite film modified electrode was fabricated via electrochemical polymerization of pyrrole in the presence of K4Fe(CN)6. The resulting electrode exhibited strong electrocatalytic activity towards the reduction of H2O2. Under the optimal conditions, a linear range of 2.0×10.6 to 2.4×10.3 mol·L.1 with the detection limit of 7.5×10.7 mol·L.1 (S/N=3), and a sensitivity of 61.3 μA·(mmol·L-1).1 were obtained.