The ultrasonic-aided extraction of blueberry pigments was optimized by single-factor and central composite design methods. Besides,the stability of blueberry pigments under different environmental conditions was also measured. The optimal conditions for the extraction of blueberry pigments were found to be:extraction solvent,45% alcohol; ultrasonic power,450 W; material/liquid ratio,1:13,extraction temperature,55 ℃,extraction duration,50 min; and pH 4.5. The extraction rate of blueberry pigments was 3.26% u...