A novel PABSA modified glassy carbon electrode(PABSA/GCE) was fabricated by electropolymerizing PABSA on the surface of GC electrode.Morin can effectively accumulate on the electrode for the π-π stacking reaction between the aromatic rings of morin and the dimers of PABSA and cause an increased anodic peak signal.Based on this，a method was developed for the determination of morin.The electrochemical behaviors of morin on the modified electrode were investigated using cyclic voltammetry(CV) and differential pulse voltammetry(DPV) .The results showed that，in pH 7.0 PBS，morin generated a sensitive anodic peak at 0.214 V.Under the optimized conditions，DPV was used for detecting morin.The calibration curve was linear in the range of 5.0×10-7-1.0×10-3 mol/L，with a detection limit of 1.0×10-7 mol/L.The modified electrode，with the advantages of good stability，repeatability and wide linear range，was successfully applied in the determination of morin content in ramulus mori.