In order to study the phenomenon of a circular disc with a hole at its center being able to float on the water surface under vertical inflow, this article conducted experimental measurements and analysis. We tested discs with diameters of 15 cm and 20 cm and center hole diameters of 0.5 cm, and compared the flow velocity and flow rate ranges of discs with and without a concave center hole. The results showed that discs with a concave center hole had a larger range of flow velocity and flow rate than those without, and as the diameter of the disc increased, so did the flow velocity and flow rate. We also measured the pressure difference between the upper and lower surfaces of the disc through experiments and found that the larger the diameter of the disc, the greater the pressure difference between the upper and lower surfaces. In addition, we found that the additional pressure force generated by the water leap was very small and could be ignored. Studying these thin plate phenomena is of great significance for fields such as aviation, navigation, and civil engineering.