Abstract: Corn is an important crop. It is not only essential for stock raising as energy food, but also very important raw material for starch and alcohol industry. Drying is vital for corn safe storage. However, unsuitable drying can decrease its feeding and processing quality. Firstly, the research status both at home and abroad about the effect of corn drying on its amino acid digestion, gain of starch, purity of starch, property of starch and gain of germ oil ect., which are the key indices for corn feeding and processing quality evaluation, were introduced. Secondly, the research methods and detecting instrument were summarized. Lastly, new drying technologies for increasing the drying quality of corn were also introduced and some advice for future research was given according to the planting and processing trends of corn.