Ti/SnO₂ electrode was prepared by thermal decomposition method. With phenol taken as the goal pollutant, the optimum conditions of electrolysis of phenol wastewater on electrode were studied together with the voltage after electrolysis for a certain time and the lifetime of electrode. The results show that the initial mass concentration of phenol solution was 70 mg/L at the current density of 190 A/m² and pH value of 2. After 350 minutes of electrolysis, the degradation efficiencies of phenol and COD were the highest, 96. 80% and 40%, respectively. Phenol was degraded into intermediate product, which was not completely mineralized to CO₂ and H₂O, and the voltage was 8V. The lifetime of the electrode was measured at 25℃, 0. 5 mol/L H₂SO₄ solution and 500 A/m² constant flow. The electrode life was only 8 hours and the life was short.