Abstract: The ratio of longitudinal tensile reinforcement in the reinforced concrete beams is the main factor influencing the bearing force.The change of the ratio of reinforcement will result in the change of the bearing force and the bearing performance.This paper,by comparing the minimal ratios of tensile reinforcement in the reinforced concrete beams stipulated in the new and old codes for the design of the concrete reinforcement,discusses the problem of adopting ratio of reinforcement in order to provide reference for the designers to understand the new codes.