The hydraulic performance of sieve Runde tray was studied with water and air as working media, the effects of opening ratio of fixed valve, F factor and spray density on dry pressure drop, total pressure drop, clean liquid height, average foaming height and operating flexibility were examined in cold model experiments, and compared with conventional sieve dual flow tray under the same conditions. The results show that the operating flexibility of sieve Runde tray is 51.4% lager than that of conventional sieve dual flow tray on average in the experimental conditions. The total pressure drop under the opening ratio of fixed valves of sieve Runde tray at 33.3% is 72.38% lower than that of conventional sieve dual flow tray on average, and its dry pressure drop is 88.8% and 206.3% lower than that of the opening ratios of fixed valves at 50.0% and 66.7% on average. The optimal opening ratio of fixed valves is 33.3%. The correlations of experimental data is obtained for calculation of the dry pressure drop of the tray as pd=49.98F1.785.