Abstract:In order to improve the quality of dried jujube，four different pretreatment technologies（ultrasonic，hot water，alkaline ethyl oleate emulsion and freezing）were applied to the pretreatment of jujube drying.The hot-air-microwave combined drying technology was used to dry the jujube to explore different treatment methods.The contents of phenols，soluble sugars，organic acids，triterpene acids，vitamin C，total phenols and total flavones in jujube were compared，and their antioxidant capacity was compared.The results showed that eight phenolic compounds，four soluble sugars，four organic acids and four triterpenoids were identified in four different pretreatment groups.Catechin and chlorogenic acid were the main phenolic substances，sucrose was the main soluble sugar，citric acid，succinic acid and fumaric acid were the main organic acids，betulinic acid and ursolic acid were the main triterpenoid.Compared with other treatment groups，the jujube dried with hotair-microwave drying after pretreatment with ultrasound had higher contents of major phenols，soluble sugars，organic acids and triterpenoids.Vitamin C，total phenols and total flavonoids were higher and resistant to the strong oxidative activity indicated that ultrasonic treatment was an excellent pre-drying method for jujube.