For resolving plugging problem of the round baler with steel rolls, structure-improving of the steelroll round baler was experimented. In the experimental study, single feeding roll and twin feeding rolls for enhancing feeding capability were experimented separately by feeding capability and reliability. By structureimproving experiment for five years, the round baler with twin feeding rolls was developed, which could resolve plugging in strawbaling course, and improve the adaptability for dry rice straw and green rice straw. It showed the round baler was practical to baling, and could enhance the reliability.