Abstract: In view of the large difference of cold and heat demand in the drying process of agricultural products.The idea of constant ratio coupling of double effect heat pump system and three effect heat pump system to construct cold and heat balance system is proposed.Then,the main parts of the heat pump system are determined by quantitative accounting and model selection,and then the control logic of cold and heat balance dryer combined with multi heat pump system with the ratio of double effect unit to three effect unit of 3:1 is designed.Finally,one driven multi cold and heat balance dryer,which can process 12 000 kg of sausage raw materials in batches,has been jointly developed with the enterprise.“Panax notoginseng”Cantonese sausage was used as the test material,The data show that the average temperature control accuracy of the cold and heat balance dryer is-2.75%～1.65%,the average relative humidity control accuracy is-3.92%～1.85%,and the drying unevenness is 1%.Sensory properties of the products in the test batch are qualified through sampling inspection,its average moisture content is 15.76%,the nitrite content and peroxide value of the products are far less than the limit value of the national standard,and the overall quality meets the requirements of super sausage.The cold and heat balance dryer combined with multi heat pump system is also suitable for batch drying and processing of fruits and vegetables,meat products and aquatic fish products.