Abstract: The weeping rates of cross-type valve trays were measured in a φ1000mm column by using air-water system, and the influence of liquid flow rate and outlet weir height were studied. The weeping rates of the cross-type valve trays in different situations were compared with the interlaced cross-type valve trays, the combined directed valve trays and the F1 valve trays, which shows that the cross-type valve trays have better weeping performance for small liquid stream and when the gas velocity is higher than the valve hole critical gas-velocity. By correlating the experimental data, equations of gas velocity with weeping point of the cross-type valve trays were obtained.