A poly( valine) modified electrode was prepared by cyclic voltammetry.The modified electrode showed an excellent electrocatalytical effect on the oxidation of kojic acid.The voltammetric behavior and electrochemical analysis method of kojic acid were studied on the modified electrode.The effect of pH value on the response of kojic acid was studied in acetate buffer solutions( ABS).The results show that the oxidation peak potential of kojic acid shift negatively with increasing of pH value and a well-defined oxidation wave was obtained in ABS of pH = 5.4.The oxidation peak currents of kojic acid increased linearly with its concentration in the range of 7.00 × 10- 6~ 6.50 × 10- 4mol/L.The linear regression equation is i pa( A) = 0.048c + 3.89 × 10- 6,correlation coefficient is 0.998 3,the detection limit( S/N = 3) is 8.50 × 10- 7mol/L.The poly( valine) modified electrode showed good sensitivity,selectivity,and stability.It can be applied to the analysis of kojic acid in food.