Abstract: Under severe situation of environmental pollution and prevention in China，air source heat pump drying technology and equipment are taking the place of coal fire hot air drying chamber gradually on agricultural products origin drying.Operating principle of heat pump drying technology was outlined and it was classified into heat pump heating drying equipment and heat pump dehumidification drying equipment based on technical characteristics of heat pump drying technology and equipment applied to agricultural products post-harvest treatment in China.Advantage and disadvantage of technology were also analyzed，and existed problems and its future development were explored briefly.With advantages of energy conservation and environmental protection，air source heat pump drying technology and equipment have a broad development and application prospects.