研究了顺流干燥机干燥玉米时应力裂纹的生成和发展规律。影响玉米应力裂纹率的因素主要有热风温度、热风速度、谷物的初始和终了含水率、谷物的干燥次数、冷却工艺等。在干燥、冷却和冷后储存过程中都有裂纹发生，冷却和冷后短暂的储存过程中发生和扩展的裂纹占相当大的比例。裂纹的类型主要有单裂、双裂和龟裂，裂纹发展的最终类型为龟裂，在所有的试验组中，龟裂占总裂纹的５０％以上 The formation and development of stress cracks in downstream drying maize were studied. Factors that affect the rate of stress cracks in corn are hot air temperature, hot air velocity, initial and final grain moisture content, number of dry grains, cooling process and so on. Cracks occur during drying, cooling and post-cold storage, with a significant proportion of cracks occurring and propagating during short-term storage after cooling and cooling. The types of cracks are mainly single crack, double crack and crack, the final type of crack development is crack, in all the test group, cracks accounted for more than 50% of the total crack