A modified electrode based on chitosan-copper complex（CTS-Cu） was developed for the quick determination of hydrogen peroxide（H2O2）.The CTS-Cu complex was prepared via the coordination interaction of chitosan and copper（Ⅱ） salt and was used to modify glassy carbon electrode（GCE）.The electrocatalytic performance of the resulting CTS-Cu modified electrode（CTS-Cu/GCE） to H2O2 was investigated by cyclic voltammetry（CV） and chronoamperometry（CA）.The mechanism of the catalytic reaction was further discussed.The experimental conditions were optimized and listed as follows：0.1 mol/L phosphate buffer solution（PBS，pH 7.0） was used as the reaction medium，the concentration of copper（Ⅱ） in the CTS-Cu modified solution was 6 mmol/L，and the applied potential was-0.20 V.Under the optimum conditions，the peak current of the modified electrode was proportional to the concentration of H2O2 in the range of 3.9×10-5-1.4×10-3 mol/L with a detection limit of 3.6×10-6 mol/L.The relative standard deviation（RSD，n=5） was 3.4%.The results indicated that the preparation method was simple，and the employment of the modified electrode was also convenient.Moreover，the modified electrode has the advantages of high sensitivity，excellent electrocatalytic performance to H2O2，and good anti interference ability in the determination of H2O2 with satisfactory result.