Abstract：The structure design and feature of a new type of 3D round valves were analyzed particularly. In an experimental rectangular column of 1000 mm′350 mm, the compared experiments between two trays equipped with 3D round valves and F1 type valves respectively were performed by employing a typical model experimental system of water-air. In the experiments, hydraulic properties, such as tray pressure drop, entrainment rate and leakage rate, were measured, and mass transfer efficiency were determined through the method of oxygen-absorption. The experimental results demonstrate that under the same condition, compared with that of the tray equipped with F1 type valves, the tray efficiency of 3D round valve is improved by about 20%, and its entrainment rate is slightly lowered. In the range of application in industry, the tray pressure drop and leakage rate of 3D round valves are both lower than those of F1 type tray. Consequently, the 3D round valve is proven to be a better valve in terms of comprehensive technology.