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A multiwalled carbon nanotubes/poly(bromocresol green)modfied glassy carbon electrode (MWNTs-PBG/GCE)was used to investigate the electrochemical behavior of reduced glutathione(GSH).GSH showed an irreversible oxidation process on MWNTs-PBG/GCE with an oxidation peak at 0.77 V(vs.SCE)in a phosphate buffer solution(pH=4.0).The kinetic parameters of the electrochemical behavior of GSH on MWNTs-PBG/GCE were calculated.Under the optimal conditions and with the help of amperometric method,a linear relationship was obtained between the oxidation peak current and GSH concentration in the range from 2× 10-7 mol/L to 5× 10-6 mol/L with the detection limit as 1 × 10-8 mol/L(signal-to-noise ratio of 3).The current reached the steady-state current within about 5 s.The modified electrode surface had very good reproducibility and stability.