Abstract: Eliminating aniline in water was investigated by sodium permanganate. It is showed that with the increase of sodium permanganate, aniline eliminating rate increases. Aniline eliminating rate reaches 92.12% by the condition of aniline concentration lO mg/L, temperature 18°C ,pH 6.8, reaction time 30 min and sodium permanganate 30 mg/L. The pH value of water sample plays a role on aniline elimination. The effect of removing aniline in alid or alkaline solutions is more significant than in neutral water. The aniline eliminating rate is 97.55% at pH value 3 and 96.33% at pH value 11. Increasing the temperature or the reaction time has good effects on removing aniline. By the cooperation of permanganate and the formed oxygen, aniline is oxidated into guinone and removed.