(1) Summer maturing corn varieties should be selected in China; (2) The shreds should be harvested and chopped, and transported and produced to install the pool, so as to maintain the green and moisture of the straw, and no loss of nutrition. (3) When the pool is installed, the moisture content of the silage should be 65-75%. It is advisable to hold the water in the hand; 4-5 kg ​​of urea per ton of green material should be mixed; the temperature should be less than 40 degrees. Loading speed should be fast, layered and compacted, sealing must be strict. The shorter the loading and sealing time, the better. (4) During fermentation, the temperature is controlled at about 30 degrees and the pH should be gradually reduced to 4.