本文重点探讨了大田玉米弱小株形成的原因、规律。指出，随着密度的增加，大田弱株率也随之增加，弱株的生产能力通常是健株的４０％左右，弱株是影响产量进一步提高的重要障碍因素之一，并提出了在提高播种质量的前提下，增加予留苗基数，及时分期去除弱株的增产措施。经大田示范，证明该项技术可增产玉米４．８％～１１．７％。 This article focuses on the formation of field weak corn plants causes, laws. Pointed out that with the increase of density, the field weak strain rate also increases, the weak strain productivity is usually about 40% of healthy strains, weak strain is one of the important obstacles to further improve the yield, and put forward to improve Sowing quality under the premise of increasing the number of leaves to stay, timely removal of weak strains of the measures to increase production. Demonstration by the Daejeon proved that this technology can increase corn yield by 4.8% ~ 11.7%.