Abstract:Heat pump drying technology is a drying technology of heat recovering and energy saving，it is widely used in processing of agricultural products.In recent years，it is more inclined to use pretreatment technology combined with basic heat pump drying or heat pump drying combined with other drying techniques to update the process .The research progress of pretreatment combined with heat pump drying technology and combined drying of heat pump drying and other drying technologies was reviewed.And the application status of different pretreatment methods combined with heat pump drying was summarized.It was intended to provide reference for the process update of heat pump drying technology matching different drying materials.