Abstract: In order to solve the problems of high energy consumption,serious pollution and low quality of dried products during the drying process of fruits and vegetables,comprehensive utilization of three heat sources of solar energy,heat pump and combustion furnace and two drying technologies of hot air drying and vacuum drying are proposed and designed based on multiple complementary fruit and vegetable hot-air vacuum combined drying equipment.We set up an equipment test platform and conducted a drying test with carrots as the test material.The results show that the four drying modes,including desulfurization and dust removal treatment,have both desulfurization and dust removal rates above 90%,effectively reducing the environmental pollution.The concentration of pollutants produced by the combined drying mode based on clean energy is lower than that of the combined drying mode based on the combustion furnace;the combined drying of carrots has better retention of nutrients,less shrinkage in appearance,and the drying quality is similar to that of the vacuum drying.