To evaluate the digestible nutrients and feed quality of corn silage, corn plant was ensiled in small concrete silos at three stages of growth, viz milk-dough, dent-ripe, and ripe stage. Determining the digestibility, acidity and organic acids with the silages, obtained results as follows. 1. The yields of dry matter per 10a were 1,273㎏ at milk-dough stage, 1,854㎏ at dent-ripe stage, and 1,678㎏ at ripe stage, respectively. 2. the quality of all the silages were excellent and pH value of them were ideal. 3. The TDN contents on dry matter basis of the silages were 60.02, 61.87 and 59.80% at milk-dough, dent-ripe and ripe stage, respectively. 4. The yields of TDB per 10a were 742, 1,147 and 1,003㎏ at milk-dough, dent-ripe and ripe stage, respectively.