Abstract: Combining experiment and numerical simulation, the gas-liquid two-phase flow characteristics of plane were studied in this paper. Ventilated two-phase flows phenomenon was observed by a high-speed photograph, and its flow field was simulated by using the Level Set method and RNG <i<k</i<-<i<ε</i< turbulence model. The results show that, the pressure of air layer coverage area is an important parameter to evaluate the formation of air layer:the location that high pressure between bubbles disappears is the initial location of air layer; when the air layer forms, the pressure tends to be consistent. Vortex structure has different characteristics during the air layer forming process. During the initial location kidney-shaped vortexes disappear gradually. When the air layer is formed, the vortexes regenerate. With the increase of space between pores, the forming locations of air layer move downstream due to transverse distance increases, but the interaction region changes little.