In order to investigate the oxidation and degradation effect of potassium on naphthalene,the main factors affecting the degradation rate of naphthalene were determined by single factor experiments,and the degradation conditions of naphthalene were optimized by response surface analysis.The results show that the best degradation condition of potassium ferrate for mass concentratoion of 5.0 mg/L naphthalene are as follows:the temperature is 25 ℃,the pH is 7.0, the dosage of potassium ferrate is 0.60 g/L,and the react time is 30 min.Under the optimum oxidation degradation condition,the rate of naphthalene is 75.60%.The results of single factor experiment show that pH(A),the initial mass concentration of naphthalene(B), and the potassium ferrate dosage(C) are the main factors affecting the degradation rate of naphthalene,and the degree of influence is from big to small C>B>A.The results of multifactor experiment show that the order of interfactors from big to small is AC>AB>BC.The model predicted the optimal degradation conditions of naphthalene by potassium perferrate:the temperature is 25 ℃,the initial mass concentration of naphthalene is 2.79 mg/L and the pH is 6.8,the mass concentration of potassium ferrate is 0.90 g/L,and the reaction time is 30 min.Under the optimum degradation conditions,the highest degradaton rate of naphthalene is 91.82%.