Abstract: In order to improve the catalytic efficiency of the heterogeneous Fenton catalysts, the heterogeneous Fenton catalysts of Mo-doped FeS₂ (FeS₂@Mo) were synthesized by solvothermal method for the catalytic degradation of bisphenol A (BPA) in water. The morphology and structural composition of the catalysts were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD). And the effects of H₂O₂ concentration, FeS₂@Mo dosage, and initial pH value on BPA degradation efficiency were studied. The results showed that the Mo-doped FeS₂ presented petal-shaped spheroids with a size of 200-500 nm. The degradation effect is optimal at 5 mM H₂O₂, 100 mg/L FeS₂@Mo, and pH=3.5, and the degradation rate of BPA within 10 min reach 99.1%. Quenching experiments and electron paramagnetic resonance (EPR) tests confirmed the major active components of the system, included hydroxyl radicals(·OH), singlet oxygen(¹O₂) and superoxide radicals(·O₂^-), and ·OH and ¹O₂ were dominance. By measuring the concentration changes of Fe^3%2B and Fe^2%2B in the two reaction systems of FeS₂ and FeS2@Mo, it was found that the doping of Mo increased the ratio of Fe^2%2B in the solution, which promoted the conversion of Fe^3%2B to Fe^2%2B, improving the catalytic efficiency of Fenton.