Abstract:The orthogonal test was employed to optimize the parameters of vacuum freeze-drying of honey pomelo.The effects of pre-freezing temperature，sublimation drying temperature，and desorption drying temperature on the moisture content，color difference，rehydration property，and drying rate of honey pomelo were studied.Comprehensive scoring method was used to normalize the four indexes and determine the best combination of parameters for the drying process.The results showed that pre-freezing temperature and desorption drying temperature had significant effects on the comprehensive drying effect，while the sublimation drying temperature had no significant effect.The effects of the three factors on the comprehensive drying performance followed the order of pre-freezing temperature>desorption drying temperature>sublimation drying temperature.The optimal combination was pre-freezing at-25℃，sublimation drying at 50℃，and desorption drying at 60℃.The product dried under these conditions had the moisture content of 1.62%，the total color difference of 11.73，the rehydration ratio of 4.29，and the drying rate of 5.90%/h.The research results can provide a reference for the practical production of honey pomelo.