Using freeze-dried pitaya peel and pulp samples as raw materials,response surface methodology was used to optimize the cellulase-ultrasonic extraction process of pigment from pitaya peel and pulp.The optimal extraction process of pigment from pitaya pericarp was as followed:extraction time 24 min,extraction temperature 39℃,ultrasonic power 325 W,ethanol concentration 23%,the yield was(81.661 3±0.762 0)mg/100 g;The optimum extraction conditions of pigment from pitaya pulp were as follows:extraction time 34 min,extraction temperature 41℃,ultrasonic power 315 W,etha...