The flow and interaction between slag, metals, and bubbles are very complicated phenomena in metallurgical processes, such as desulfurization in hot metal pretreatment, steelmaking process in a converter, and second refining process. The molten steel or hot metal can be entrained into the slag when a bubble or bubbles flow through the slag-metal interface during the metallurgical process. The bubble entrainment behavior can increase the heat and mass transfer and, in turn, increase the chemical reaction efficiency of the slag-metal interface. Investigating the entrainment behavior helps in understanding the interaction between bubbles and liquid phases. The current study focuses on the effects of bubbles and slag properties on the bubble entrainment behaviors at the slag-metal interface. The results show that the bubble size is the most important factor influencing the entrainment, followed by the slag density. The slag viscosity and interfacial tension of the slag-metal interface show a weaker effect on the entrainment. In particular, the entrainment volume of steel and maximum area of the slag-metal interface increase by 7.41 and 3.67 times when the bubble diameter increased from 10 to 16 mm, respectively. When the slag density increases from 2000 to 5000 kg/m³, the entrainment volume of steel and maximum area of the slag-metal interface increase by 62.3% and 13.1%, respectively. The increasing in slag viscosity and interfacial tension is less affected by slag entrainment and interface area. The entrainment volume of steel and maximum area of the slag-metal interface are decreased by 30.6% and 6.4% when the interfacial tension of the slag-metal interface increases from 0.65 to 1.10 N/m, respectively. Similarly, when the slag viscosity increases from 0.05 to 2.0 Pa·s, the entrainment volume of steel and maximum area of the slag-metal decrease by 18.4% and 10.2%, respectively.