A research team at Huazhong University of Science and Technology (HUST) has proposed an innovative laser-induced ultrasound-assisted laser-induced breakdown spectroscopy (LIBS) technique to address the challenge of in-situ compositional analysis during metal additive manufacturing. Conventional LIBS suffers severely from the 'matrix effect,' where the signal intensity of target elements is interfered by the composition and microstructure of the sample matrix, resulting in low quantitative precision. The new method applies a laser-induced ultrasonic pulse before laser ablation to generate controlled microplastic deformation on the sample surface, thereby standardizing the ablation process and significantly suppressing matrix effects. Experiments demonstrate a substantial improvement in quantitative accuracy for key elements (e.g., Al, Ti, Nb) in nickel-based superalloys, with detection limits reduced by an order of magnitude, providing a powerful tool for real-time, in-situ composition monitoring and quality assurance in metal additive manufacturing processes.