In order to study the extraction technology condition of tannins which come from Phyllanthus emblica fruit by ultrasonic-assisted extraction,four factors( material-liquid ratio,extraction temperatures,ultrasonic times and ultrasonic powers) were investigated in the single factor experiments. The process parameters were optimized by response surface analysis method. The optimum extraction conditions of phyllanthus emblica fruit tannins were determined as: liquid-material ratio: 69∶ 1( mL∶ g),extraction temperature 62 ℃,ultrasonic times 32 min and ultrasonic powers 180 W. Under the above conditions,the extraction of tannins was 13. 94%.