Abstract: 1. Select the parent seed. The quality of parent seeds directly affects the yield and quality of maize seed production. In order to improve the yield and quality of maize seed production, it is necessary to select parent seeds that meet the national quality standards and are carefully selected, dried and coated. National standard for parent seeds: the purity, purity, moisture and germination rate of the first-class seeds are 99.9%, 98%, 13% and 90% respectively; The secondary species are 99%, 98%, 13% and 85% respectively.