The oxidation with Fenton and photo-Fenton reaction in homogeneous system is an effective technology for destruction of a large number of different dyes.  The effects of different parameters like the concentrations of H₂O₂, the concentration of FeSO₄, the initial concentration of the dye and the pH of the solution on the degradation of eriochrome Black T (EBT) dye were carried out  to investigate the process's optimal operational conditions with the best results at low cost. A suitable operating conditions were selected as: the concentration of H₂O₂ 1.14×10^-2 M, the concentration of FeSO₄ 1.85×10^-4 M, the initial concentration of EBT dye 9.34×10^-5 M and the pH equal 3.2 at room temperature. In the given conditions, more than 98.37% of degradation efficiency was achieved within 60 min. of the reaction. Photo-Fenton reaction was investigated and it was found that the degradation efficiency increased from 94 % by Fenton reaction to 99.83% by photo-Fenton reaction at 15 min. The kinetic study indicated that the degradation kinetics of EBT dye followed the second-order kinetics.