The purpose of air blowing is to promote the flow of air in the drying box, on the one hand, to make the temperature inside the box uniform, and on the other hand, to quickly evaporate the moisture in the coal and shorten the experimental period. The experiment proved that the moisture values measured after drying for 1 hour under blowing conditions were higher than those measured without blowing conditions; In the subsequent 0.5 hours of detection drying, only one test is required under blowing conditions to achieve a constant weight of the sample. However, without blowing, multiple tests are often required to achieve a constant weight.