The main outline of this investigation is demonstrating the behavior and details of gas-liquid contact on the cross-current trays using a 3D CFD model. The model has been applied to several operating conditions, and the effect of gas and liquid flow rates on the contact characteristics was studied, and in-depth picturing of local events was presented. Based on the picturing of details of flow features, an innovative division of flow region on the tray deck was presented. The tray is divided into four regions having different characteristics of flow phenomena, and these regions and their flow features are described as a novel outlook in this way. Although the extent of nonuniformities and interfacial area density are dependent on the operating conditions, but partial to total nonuniformities and weak phase mixing are present in all four regions.