This paper primarily introduces research on the process optimization of steel-aluminum spot welding joint performance and the robust design of welding parameters. Using the Pugh Matrix Analysis, the study compares solutions such as enhanced rivet materials, modified rivet structures, and optimized riveting/spot welding parameters based on factors including joint strength, weld nugget diameter, and cost efficiency, ultimately selecting steel-aluminum spot welding as the optimal strategy. Subsequently, the Taguchi Method and orthogonal experiments are employed to study the influence of welding current, welding pressure, welding time, and electrode cap diameter on joint strength of steel-aluminum spot welding. Finally, a set of optimal welding parameters are selected from the perspective of maximizing shear strength, and steel aluminum spot welding and shear tests are conducted to verify their effectiveness and robustness.