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In order to solve the problem of excessive energy consumption of high moisture grain drying, a high moisture grain dryer was designed, and the state parameters in high moisture grain drying and the change characteristics of moisture binding energy were analyzed. From the theoretical and experimental evidences, the utilization effects of drying potential energy and the changing process for the temperature and moisture of high moisture grain dryer were illustrated and observed. The experimental result showed that the temperature of grain could be reduced and was lower than environment temperature nearly 10℃ when temperature was 30℃, relative humidity was 40% and drying rate was more than 0.76%/h. The result also pointed out the design method of grain drying process for saving energy and provided energy efficiency of pre-drying equipment for large-scale grain drying companies.