AIM To establish a HPLC method for the determination of ketoconazole in lotion.METHOD The reversed C 18 column was used. The mobile phase consisted of methanol-water(80:20)with 500μg triethanolamine.Detectlve wave was 244nm.RESULTS The linear range was from 40 to 120μg·ml -1 ,r=0.9998.The average recovery was 98.3% with RSD=0.73%.CONCLUSION The method can be used in the determination of ketoconazole in lotion.