Abstract: This paper presents a new half-ellipse fixed valve tray，which has some improvements on traditional fixed valve trays. The hydrodynamic and mass transfer performance of half-ellipse fixed valve tray，sieve tray and F1 valve tray was experimentally studied with air-water-oxygen system in a 1200mm stainless steel column. The results showed that the half-ellipse fixed valve tray possessed，less entrainment，lower weeping and higher efficiency，but a little higher pressure drop than sieve tray as well as much lower pressure drop，less entrainment，and higher efficiency，but higher weeping than F1 valve tray.