The treatment of phenol wastewater in supercritical water oxidation system by using hydrogen peroxide as oxidant was introduced. Under the test condition, phenol was decomposed remarkably. The oxidation of phenol wastewater indicated that the dose of H_2O_2, the systematic temperature, the pressure and the resident time of wastewater in the system were the factors affecting the removal efficiency of COD. The results showed that the oxidation efficiency approached to 100 % in the system of K=2.0 (dose ratio ...