Abstract: Two experiments were made for seven masses of com by aeration with ambient air. In those two experiments, three air distribution systems were used, one made of U-shaped movable tripod ducts equiped with axial flow or centrifugal fans, another one made of lateral ducts expending from the central main duct with axial-flow fans, and the last one composed of brick-stack duct with axial-fans.In the first experiment, corn's initial moisture content was between 16.53 % and 17.52 %, with grain depth ranging between 2.2 and 2.5 meters, the air temperature during the experiment var ied from 1.14 to 13℃, and the average relative humidity 59% to 61%. After 31.5 to 46 hours of discontinual aeration with the airflow rate of 51 to 95 m³/ t · h, the moisture content failed uniformly into the range of 13.78% to 14.73%, a desired content for safe storage of corn. The corn in the second experiment, with the initial moisture content of 16.46% to 60.98%. was piled with a depth of 2 to 4 meters. The air temperature varied bewteen 7 to 16.8℃, and the average relative humidity 46% to 60% . After about 42 hours of aeration with an airflow rate of 41 to 90 m³/ t · h,the moisture content was reduced to a range of 13.47% to 14.02%, the electricity consumption was 0.015 to 0.041 kilowatt-hour per kilogram of evaporated water.