Academy of national food and strategic reserves administration designed a rotating air drying barn. The research on dewatering technology of high-moisture corn was carried out in this paper by using the self-developed rotating air drying barn. High moisture corn was stored in this kind of dry storage, and the precipitation process was studied. During the experiment, the temperature and humidity at different positions of the grain stack in the barn as well as the ambient temperature and humidity were monitored regularly, and the moisture content of corn and fungal spores were detected by regular sampling. The results showed that the temperature and humidity of the monitoring points in the grain heap changed with the environment, and the temperature and humidity data of the detection points in the same layer or column were basically the same. Under the condition of snow (rain turned to snow on the 6th day of the experiment), the moisture content of corn decreased from 27.12% to 14.60% within 18 days. The number of fungal spores carried by corn was kept within the critical range of fungal growth which achieved the goal of short-term safe storage. Therefore, it is feasible to dehydrate high moisture corn by adopting rotating air drying barn. The dewatering effect is uniform and efficient, which effectively ensures the grain free from heat and mildew. Moreover, the method of rotary ventilation drying does not use coal or gas burning which meets the new requirements of environmental protection and sustainable development in China. With significant economic and social benefits. The self-developed rotating air drying barn can be popularized and applied in big farmers' corn drying and short-term safe storage.