Abstract: Abstract: Moisture content of paddy in South china is mostly above 22%-28%. The energy consumption of drying process is higher in high temperature and high humidity environment than in other environment. Its main reasons are new theory and technology application, and lack of the reasonable design of drying process system. According to the researches at present, evaporation from grains with high moisture content was little affected by grain features, and moisture binding energy of grains with low moisture content was significantly decreased with increasing temperature. The law of binding energy of high moisture content paddy changed with moisture content was obtained. Energy structure of drying system was revealed based on the drying exergy transferring theory of grain. In order to develop industrial application, reduce the energy consumption in the drying process of high moisture content paddy and improve drying efficiency, based on the drying characteristics and exergy transferring theory of high moisture content paddy, a drying process system of high moisture content paddy was designed which could make full use of the normal temperature natural air, be effective recovery of waste heat of flue gas, and achieve energy-efficient drying of high moisture content paddy. Its process curve of ventilate cooling and dehumidifying was drew out and the principle of design was explained. The energy-saving effect was verified by tests. It was pointed out that the segmented dry process model was one of the important ways to solve the problem of high energy consumption. The results of practical applications in a high moisture paddy drying storage warehouse showed that the average moisture content of 31% (dry basis) of high moisture paddy was decreased to 11.36% and the waste flue gas heat was recycled more than 50%, when the ratio of air flux to grain mass was 149 m3/(h·t), ventilation for 2 hours while intervals of 1 hour, and the accumulative storage dry 18 hours. According to the southern climate characteristics of high temperature and high humidity, type 5HNH-15 paddy countercurrent dryer and energy-saving drying process system were designed. Test showed that the subjective heat in drying system wasting converting into a unit heat consumption of high moisture paddy was 2 939 kJ/kg. Compared with national standard, which was less than 7 400 kJ/kg, the highest energy saving could reach 60%. The results pointed out that, in order to realize high quality, high efficiency, energy-saving in high moisture paddy drying, the reasonable process system design was given priority to objective potential use and subjective thermal energy consumption was complementary. The reliability of the technology solutions were confirmed by theory and experiment. The results of the study pointed out a high efficiency and energy-saving way of design for grain drying, and it provided reference for the large grain drying process system design.