Forage grass maize production process

The invention relates to a method for producing forage grass corn hybrid. Wherein, it uses the corn-tetraploid corn substitution system 068 as mother, uses the corn sibling species tetraploid corn 9475 as father to cross to obtain the forage grass corn SAUMZ1. And it adjusts the seeding time, cuts capillament, adjusts the planting density, emasculates from the mother, adjusts the flower period, pollinates artificially, and harvests at right time. The invention can improve yield and quality.