Abstract: Polyvinyldene-fluoride(PVDF) hollow fiber membrane was treated by impregnating it in KMnO_4 solution which was selected as oxidizing agent.Treatment conditions were varied as a function of oxidant solution concentration,temperature and duration of treatment,and solution acidity and evaluation indexes such as flux,pressure of appearing bubbles,pressure of burst,tensile strength and breaking elongation were optimized.The results showed that for safe application,the concentration of KMnO_4 solution is(1 000 mg/L,) the temperature,(35 ℃,) and the appropriate hydrochloric acid concentration,(500 mg/L.)