Abstract: During MIG welding of galvanized sheets, the significant evaporation of the zinc coating reduces the stability of the arc and increases weld defects, thereby deteriorating its usability and lifespan. To address this issue, a low-power laser-induced MIG arc hybrid welding system was established using CuSi₃ wire as filler material for lap welding of galvanized sheets. The behavior of the arc before and after introducing the laser was investigated and the optimal parameters for hybrid welding were identified. The results show that during standalone MIG arc welding, a large amount of zinc vapor emits from the bottom of the arc, causing the arc to be unstable and exhibiting edge curling. In contrast, during hybrid welding, the arc exhibits a "trumpet" shape, with no edge curling and exceptional stability. When the distance between the wires(D_lw) ranges from 1.0 to 2.0 mm and the laser power（P） exceeds 100 W, higher laser power results in a more stable arc. This study is of great significance for the development and theoretical enrichment of high quality welding of galvanized sheet.