Abstract:In this study，superheated steam combined with low temperature was used to dry Tremella fuciformis and investigated the effects of different superheated steam temperatures（110，115，120，125，130 ℃），conversion times（9，15，21，27，33 min），and low temperatures（40，45，50，55，60 ℃）.The results showed that both superheated steam temperature and low-temperature drying influenced the drying process of Tremella fuciformis，but low-temperature drying had a greater influence.The higher the temperature was，the shorter was the drying time.The combined drying process of Tremella fuciformis consisted of stages of increasing，constant，and decreasing speeds.In the superheated steam drying stage，the increasing speed stage was very short，and it mainly wentthrough the constant speed drying stage.The entire low-temperature drying stage consisted of deceleration.At the superheated steam drying stage，the effective diffusion coefficient of water increased with the increase of superheated steam temperature.The effective diffusion coefficient of water was 4.966×10-8 m2/s-8.836×10-8 m2/s，and the drying activation energy was 35.625 kJ/mol.In the low-temperature drying stage，the effective diffusion coefficient of water increased with the increase of temperature and the effective diffusion coefficient of water was between 3.213×10-8 m2/s and 6.718×10-8 m2/s，and the drying activation energy was 34.836 kJ/mol.Through model fitting，the cubic polynomial model can describe the superheated steam drying process of Tremella fuciformis.Furthermore，a Logarithmic model can predict the drying process of Tremella fuciformis at low temperature.