To elucidate the reaction mechanism between the nickel-based superalloy melt containing and Al₂O₃ rare earth elements Y La ceramic crucible during the preparation process of components, in-situ drop-solution method was employed to study the interface reaction between the superalloy melt containing Y and La and the Al₂O₃ ceramic crucible at 1550 ℃. Results indicate that following the occurrence of interface reactions between the superalloy melt containing rare earth elements and the Al₂O₃ ceramic crucible, the surface quality of the alloy is favorable, with almost no adhesion of reaction products. When the alloy contains only Y, Y element reacts with Al₂O₃ to produce intermediate product Y₂O₃, which subsequently continues to react to form Y₃Al₅O₁₂. Additionally, a small amount of Hf element reacts with Al₂O₃ to generate HfO₂. When the alloy contains only La, La element reacts with Al₂O₃ to generate LaAlO₃. La element inhibits the participation of Hf element in the interface reaction, and there is no generation of HfO₂. However, when the alloy simultaneously contains Y and La, due to the higher reactivity of Y element, Y preferentially reacts with Al₂O₃ over La element, forming Y₃Al₅O₁₂. As a result, the reaction between La element and Al₂O₃ is suppressed, effectively reducing the burning loss of La element.