The ratio of concrete was commissioned to the laboratory to design. The design of the concrete ratio should be carried out according to the actual situation of the concrete materials in the region. Several schemes should be made for the ratio of high-strength concrete to be tested and matched, so as to select the most guaranteed quality, economical and reasonable ratio as the on-site construction ratio. It is required that the slump of the design ratio concrete is controlled at 18cm, the initial setting time is controlled at about 5 hours, and the concrete reaches more than 80% of the design strength within 5 days to meet the requirements of slab prestressing. In order to ensure that the actual strength of the high concrete meets the design requirements, the high-strength YNB-6 admixture is added to the concrete.