In order to solve the problem of uneven gas-liquid distribution in large-scale towers caused by the presence of liquid-level gradients on cross-flow tray,a total spray tray (TST) is proposed.Its hydraulic and mass transfer performances are studied experimentally by using air-water and air-CO2-water systems as operating media.The experimental results show that compared with other spray trays,TST has the characteristics of low pressure drop,low leakage and entrainment.In addition,TST achieves higher mass transfer efficiency in the high kinetic energy factor than New VST.