Pretreatment is a common method to improve drying characteristics and product quality of fruits and vegetables.In this paper,different freeze-thaw cycles and different ultra-sonic power were used for carrots treatments before drying,the effects of pretreatment on the dr-ying characteristics and product quality of carrots by microwave freeze drying(MFD)were inves-tigated.The results showed that ultrasonic pretreatment was more advantageous than freeze-thaw pretreatment in improving the drying efficiency and product quality of MFD carrots.This study can provide a certain theoretical basis for the application of pretreatment in improving the microwave freeze dried efficiency and product quality of fruits and vegetables.
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